Plishner Work Trip Report – August 24, 2019

By Gary Agranat

Participants: Ed Corn, Steve Plock, Gary Agranat.

Ed, Steve, and I traveled to our radio telescope site, leaving from the Ellicott Fire Department a little after 7:30 am. We encountered just a little fog on the way.

Steve worked primarily on troubleshooting the amplifier failure on the 60-foot antenna fiber optic feed. Steve found a power supply no longer functioned. He wrote me later, “Damaged parts have been ordered and will be replaced at the earliest convenience.”

The 60-foot antenna dish was rotated so that Steve could access the feed from the service tower.

Ed Corn and I worked on assembling the 3-element tri-band Yagi antenna from Myron Babcock, and then the ham radio tower by the bunker, on which the Yagi antenna will go.  We measured and reassembled the three Yagi antenna elements and the boom support for them.  We’ll wait to combine those until we are ready to attach the antenna to a mast and on to the tower.  The antenna will operate on the ham 10, 15, and 20 meter bands. We decided to set the lengths so that the antenna tunes best in the center portions of the bands.

Assembly of the three elements of the tri-band Yagi antenna and its supporting boom.

We assembled the tower components out to a length of 50 feet, including the top that will hold the rotor. The tower is now designed and built to rotate from a pivot point next to the existing tower that had been started earlier.  Ed climbed that original tower to install the pulley; the pulley leverages and pulls up the 50-foot tower by rotation at the pivot.  We tested lifting the 50 foot tower with the hand crank winch that I think came from Steve.  The design works.  We eventually will need to take down the mast that supports the 80 and 160 meter dipole antennas, to complete the tower build-out.  We plan to re-attaching those antennas to the tower itself, when we are ready to complete the tower.  Ed has already fabricated two standoffs that will attach to the sides of the tower, and centrally support the dipole antennas.

Ed from time to time went to help Steve. And Steve once in a while came to help with the tower assembly.

The base of the new antenna tower pivots next to the already existing support tower. The rotating winch on the support tower will pull the antenna tower and lift it up or down.
On each of the three connecting tubes, on each of the tower elements, a set of two screws each were bolted to fasten the connections.
Ed Corn attached a pulley (fabricated before) to the support tower.
Three of the 10-foot antenna tower sections connected, and connected with the base pivot. The cable from the winch has been threaded through the pulley on the support tower above, and connected to about the 20-foot point on the antenna tower. The pipe mast visible in the photo is the center support for the existing 80 and 160 meter dipole antennas. The new antenna tower, besides supporting the directional antennas at top, will replace that mast and support those dipoles.
We tested rotating up the antenna tower with three 10-foot sections assembled. After Ed verified that the placement of the pulley was good, he securely fastened it.
The winch with cable installed, used to lift and lower the antenna tower for service. The handle crank is geared. The lock pin enables free movement, movement in one direction, and locking.
The top section of the tower, ready to be attached.
Steve helped Ed and I complete the final assembly of the tower.

We had a lunch break together in the bunker. I brought a small coffee maker and brewed coffee for Ed and me.

The weather was good, considering the heat we’ve been having lately.  High cirrostratus and mid level clouds from storms in the distance covered us for the afternoon, and kept the heat and sunshine comfortable.  We saw rain showers in the far distance, but those never came close enough to bother us. The bunker thermometer read 75 F, and outdoors was probably just a little warmer.

The Radio Jove phased dipole antenna array.
Bob Haggard’s steps provide much easier access to the Communications Trailer.
Sunflowers were blooming everywhere.
The bunker antennas in their configuration right now.

During a break I got on the air at the bunker station, and made 12 contacts for QSO parties that were running: 1 to Hawaii, 5 to Ohio, and 6 to Kansas, on CW and SSB, on 20 and 40 meters. I submitted our logs to those QSO parties later.

The 5 band vertical ham radio antenna, still in good working condition after the repair from the May storm. Photo taken in the late morning soon after we arrived. We used this to make our 12 ham radio contacts on the 20 and 40 meter bands.

For the team, Gary Agranat.

Radio Telescope Site Report, System 1 Team, August 17, 2019, by Glenn Davis

Here is a quick site trip report on the work the System 1 team (Phil Gage, Lewis Putnam, Dave Molter and Glenn Davis) completed at the Haswell Site yesterday (8/17/2019):

  1. We installed Version 4.0 of the System 1 software. This version includes a major new capability that supports manual tracking of astronomical objects. I would like to demonstrate this capability at the next Science or Engineering meeting.
  2. Version 4 included a software update to fix the Elevation Axis Bounce Issue (Erroneous Elevation Axis Status) that was identified earlier this summer and has been investigated for several years. The problem was related to the Elevation Axis Integrity Instruments 232M200 I/O module. Due to a board related hardware problem, the I/O board was always reporting bit 2 of the encoder position data as “stuck” on (1) which would create erroneous Elevation encoder data. The fix required both a hardware and software modification. The hardware modification included moving the bit 2 pin to an unused position on the connector to the I/O module (see #3) then provide a software fix that would read data from this new bit position and re-incorporate the bit data back into the Elevation encoder position data – bypassing the bad bit. This hardware/software solution has fixed the problem. The Elevation Axis is now providing the correct encoder positions through it’s range of motion and the “bouncing” has been eliminated.
  3. Dave Molter moved and soldered the “bad” Elevation Axis hardware pin to support the software modification that fixes the Elevation Axis Bounce issue.
  4. Collected Voltage to Rate information for both axis – data below:
Voltage (V) Azimuth Rates (Degs/Sec) Notes
0.00 0.00 Minimum Potentiometer Setting
0.20 0.04
0.39 0.08
0.50 0.11 Normal Potentiometer Setting
0.75 0.17
1.50 0.33
Voltage (V) Elevation Rates (Degs/Sec) Notes
0.05 0.06 Minimum Potentiometer Setting
0.17 0.07
0.35 0.08
0.75 0.11
1.52 0.15 Normal Potentiometer Setting
3.72 0.30
4.24 0.34
5.00 0.42

Please note: We were unable to produce zero rates on the elevation axis – even with the potentiometer turn all the way down.

Additionally, though we believe we returned the potentiometers back to their normal positions, whoever returns to the site for the next data collection, please ensure the potentiometers are at their normal positions before use.

Glenn Davis

Plishner Antenna Site Work Trip Reports for July 10 & 20, 2019

By Ed Corn

Trip Report for July 10

My wife and I spent the day at the site cleaning up the last of the electric basic infrastructure build out. That portion is complete with the following items completed.

  • Basic plug ins complete including a GFI plug near the sink and one in the bathroom for portable heater.
  • A pre wire and extra switch in bathroom for future ex-host fan and an electric water heater for shower and kitchen sink.
  • Box and wiring for sewer pump when that project starts.
  • Wall switch and permanent light in sleeping area.
  • The tunnel lights now have a control switch at both ends.
  • 240 volt plugins for amplifiers at the Amateur operating position.
  • The sub main electric panel in the battery room is complete and the main panel has the trim cover installed.

There will be extra plugs and services  that will be needed in the future but basic build out is complete.

* *

Scheduled Maintenance Trip Report for July 20

Steve and I went down Friday the 19th. We met Paul Berge at the house in Haswell. Paul and his wife came down Thursday and stayed over Thursday and Friday nights. Steve and I stayed in the bunker Friday night.

Paul worked on finishing installing the control wiring in the pedestal in the conduit for mechanical protection, and he installed heavy duty override switches in the override panel in the comm trailer. He also gathered information for some updates on the control wiring. He will be working on the updates at his home computer.

Steve worked on the fiber link from the feed point to the comm trailer. The wind came up Saturday so Steve will complete work later as the wind was a safety issue trying to work up at the feed point. Steve did say the az/el readout worked after cycling power.

I have the two 30 amp plug-in circuits at the old generator building completed to give us 2 more RV parking spots with heavy enough power to run 1 air conditioner in each RV. Just for information to turn lights on in the generator building you will have to turn the circuit breakers on in the distribution panel in the middle  of the North wall.

Plishner Site Work Trip Report for June 14-15, 2019

DSES Plishner Site Trip Report 6-14-2019
By: Bill Miller, Bob Haggart. Photos by Bob Haggart.

Location: Plishner Radio and Space Science Center, Haswell, Co.
Attendance: Steve Plock, Rich Russel, Jonathon Ayers, Floyd Glick, Bob Haggart, Bill Miller

Accuracy: This is only a summary of my work on Friday and Bob Haggart trip from his report for Saturday and you should add your own and correct anything I missed. WKM.

Bill Miller’s Work Trip Report, Friday, June 14th
Bill was the first to arrive at the site about 10:15 on Friday 6/14 and started by opening the trailer and removing the exhaust fan cover. He lubricated and reattaching the fan wires, started the air conditioners, swept the Comm. trailer floor and removed the mud left from the last visit.
Steve came in shortly after and he and Bill went to the top of the tower to inspect the Liquid-tight conduit that Steve had previously installed for the elevation position synchro wiring.

Jonathon Ayers came in and assisted Bill to hook up the wiring to the synchros on the elevation axis in the top deck.

Bill then got some assistance from Floyd Glick while hooking up the wiring in the control deck of the dish pedestal. Thank you to Jonathon and Floyd.
The goal was to attach the Elevation position synchro encoders to the synchro panel in the Comm. trailer. This would match to connections of the Azimuth synchros previously installed. It would complete the synchro dish position indicator system which is an accurate minimal tech backup dish positioning system that needs no computer.

Bill was under a tight schedule as Rich had a pulsar observation planned to start at 3:30. Bill tested the system and it worked initially but then started tripping the ground fault interrupter on the synchro panel within a few minutes indicating that the insulation or electrical clearance of the elevation connections was breaking down somewhere in the path. Because this circuit is 120VAC, the ground fault interrupter is critical to safe the system with the many intermediate connections and it did its job. (Caution) Bill unplugged the synchro panel from AC and it should be left unplugged until we have a chance to trace down the fault in the elevation wiring. It is most likely in the old terminal box in the control deck, moisture in the system or hasty wiring in the elevation axis Encoder box. I also believe that the synchros in the elevation axis box are either bad or incompatible and should be changed out and matched to those in the trailer synchro panel. Ed Johnson has a box of synchros from the bunker.

Bill had to leave about 4:00PM while Rich, Floyd and Steve stayed to make their Pulsar observation. This seemed to be going well but the large storm was brewing in the area and I suspect they had to abandon the site that evening.

From Bob Haggard’s Work Trip Report. Saturday, June 15th
Arrived at the DSES site 8:35am. Opened gate, opened the bunker to retrieve keys. Noticed the dish was setting at about 45 degrees. Opened the Ops trailer and the battery box for 110V AC power. Mounted the solar powered, dusk to dawn, LED porch light. Removed the camera and the broken rear trailer window. Installed the clear window and camera right side up. (there you go Rich) The molding to hold the window in was rotten, have to make 4 new ones. The putty was too old to be used, will need more on next trip.

Removed two folding chairs from battery box and stored them in the OPs trailer under the table next to the filing cabinet. Stored the donated table saw and stand in the battery box. Picked up all unused unwanted lumber (there you go Steve)

Secured the battery box and the Ops trailer. Returned the keys to the desk and secured the bunker and gate. Secured the main gate and departed at 2:45.

No one else showed up for this work day.

The weather was perfect, a mild breeze, just enough to keep you cool while working in the hot sun.

 

Plishner Site Work Trip Report for May 18, 2019

(Editor’s Note: This is Ed Corn’s report of our work at the Plishner radio telescope site during the weekend of May 18, 2019 – Gary, WA2JQZ)


I arrived about 9:30 AM and proceeded to the generator shed to install breakers and to survey the conduit route for 2 extra camper hook ups. The breaker box is ready. I will run conduit and wiring during another trip prior to the open house.


Steve Plock arrived shortly there after. We traveled separately so Steve could stay over with Paul Berge, as I have a graduation to attend on Sunday.
We looked at the ham radio tower project. All the hardware is on site but tower climbing is out for most of us. Steve decided we will assemble the tower on the ground, and tip it up with a winch at a later trip. We need a few extra parts to do this which are easily obtained or fabricated. Gary Agranat arrived and went to work on the vertical antenna. The vertical was damaged during the blizzard storm several weeks ago. He has a list of all needed parts for fixing on the next trip.


Steve moved the dish to the work stand and checked the control voltage for the feed to the preamps, and adjusted for voltage drop in the line from the communications trailer.


Steve and Gary then worked on tuning the 16o meter and 80 meter wire antennas. (Gary added: We trimmed the lengths to retune the antennas to about the center of the ham bands. The 160 meter antenna was tuned to 1.9 MHz, with a best SWR of 1.7:1. The 80 meter antenna was tuned with an SWR of 1:1 from 3.8 to 3.9 MHz. Before the tuning, each antenna was slightly long, which therefore gave better performance at the low ends of the bands. The retuning enabled better resonance in the phone portion of the bands, where several members like to participate in nets.)


I moved into the bunker and pulled wire for the sub main panel in the battery room, in preparation for the hot water heater for the sink and shower and the sewer pump system. The sub main is complete, ready for extension of the conduit runs on a future trip.


Paul arrived late afternoon and stayed the weekend with several items he wanted to work on.


Ed KC0TBE

Photos by Gary

Plishner 60-foot antenna

Haswell Site Trip Report for December 14-16, 2018

Personnel present – Bill Miller, Ed Johnson, Steve Plock, Ed Corn, Myron Babcock, Bob Haggard, Glenn Davis, Phil Gage, Hans Gaensbauer, Rich Russel.
Rich Russel and Bob Haggard showed up Friday, joined later that day by Hans Gaensbauer. All three spent the night and Rich did radio astronomy observations. Bob  Haggard finished the new front stairs for the communications trailer. Thanks Bob they look great! Everyone else came the next day. Glenn Davis and Phil Gage upgraded the software on pointing System 1, and Glenn installed the NTP server as well. Bill Miller and Ed Johnson were able to demonstrate go-to functionality on System 2 and the PID algorithm employed operated flawlessly. A milestone has been achieved and Ed plans to attempt sidereal tracking as his next step. Congratulations to all members of both pointing teams!
 The fireproof door for the bunker hallway was cut to size by Steve Plock, Myron Babcock and Hans Gaensbauer. Ed Corn continued with electrical buildout in the bunker.
 Again many thanks to all who participated and worked in the spirit of friendship and cooperation.
submitted by: Steve Plock, President DSES

Bob Haggart’s work building a new porch and stairway for the communications trailer

Bob Haggart N0CTV is working on building a new stairway and porch to the communications trailer at the radio telescope site.  He started the work at home after taking measurements. Today he traveled to the site to continue the work.  With him were his grandson Allen and Allen’s friend Ben. Bob writes:

“We arrived at 11 AM. Worked on the porch and covered the fan with 24″ X 24″ plywood. Ran out of time but did get the porch assembled and painted inside and out. The hand railing is only temporary and will finish next work day on the 17th.”

Bob’s work is replacing a small simple set of metal steps that has given us access to the communications trailer.

The original set of steps to the communications trailer. Bob’s new porch and stairway is replacing this.

The new porch and stairway provide a great improvement.

Bobs has built this new porch and stairway. It is larger, sturdier, and gives much better support. The handrail is temporary. The permanent handrail is planned to be installed on the next group work trip on Nov. 17.

Bob Haggard N0CTV, standing with his work.

Thanks to Bob for all this work, and for improving the access to the communications trailer.

DSES Science Meeting, October 22, 2018

DSES Science Meeting 10-22-2018                   Meeting Notes by Bill Miller

Location Rich Russel’s Residence, Colorado Springs

Attendance:   Gary Agranat, Ed Corn, Floyd Glick, Glenn Davis, Steve Plock, Rich Russel, Tony Bigbee, Ray Uberecken, Dave Molter, Jon Richardson, Bill Miller

Attending Remotely via TeamViewer:   Skip Crilly, Dayton Jones, Jamie Riggs

Last Trips: Oct 19 Observation Trip. Oct 20 Work trip for ED. Steve, Hans, Gary, Paul

Next Trips to site:  The regularly scheduled 3rd Saturday of the month, Saturday Nov 17th.  Observation the night before on Nov 16th

Meeting Schedule: 

  • DSES Technical and Operations Meeting- 2nd Monday of Every Month
  • DSES Science Meeting – 4th Monday of Every Month

Accuracy:  The notes for this meeting may be out of order.  This was done to group the discussion into subjects for better clarity and continuity, so they are not true chronological minutes.  As always if I have misstated, omitted or misrepresented anyone please feel free to correct me WKM.

Agenda and Notes

Ray Uberecken has his mount ready to install a 12 ft dish with capability up thru the KU band. He needs to move the dish from the KCME radio station to his site in Payton.  The dish F/D ratio is the same as the 60 ft Haswell dish, so the 12 ft dish could be used to prototype feeds and receivers for the Plishner site.  Ray would like some volunteers from the DSES to help move it next Sunday the 28th at 10AM.  (Note: Recent change of plans.  Ray will hire a crane to pick the dish out of the KCME yard enclosure before disassembly.  This is currently scheduled for 7 AM Saturday, November 10th.) He could use some volunteers,  power drills with sockets and a trailer.  KCME is at Fontanero and 1921 N. Weber in.  Bill will send an EMAIL out to the group.

Once the dish is in place the first thing that Ray will install is a Dicke Switch.

Ray also wants to know if we want to use the 8 channel UHF remote at the site for reset and control of the systems.  We have not been using it, but that is available and installed in the communications trailer rack and can be commanded remotely from Ray’s residence.

Ray has also started his optical observatory with 8 inch Celestron and a good refractor at his residence.

 

Dr. Rich Russel reviewed his new Radio Astronomy Guide Rev. 3.

The RA/Dec of many of the objects are from both celestial coordinate year 1950 epoch and year 2000 epoch, so needs updating.

The output of the SpectraCyber is in volts and a translation to Jansky is needed. 

Rich and Gary observed a number of sources on the Oct. 19th observation trip.

Some source positions were very good.  Others were not.  This may indicate a pointing error or other system issue.

They were getting a lot of clear source signatures but don’t know what many of them were.  Rich would like to do cross galactic scans while changing declination to map the whole area in the future.

Cassiopeia A, Cas-A, was thought to be seen, but at a relatively low amplitude. Cas-A, being a 2200 Jy source it should have been clearly seen but they weren’t sure they had it.

Sagittarius A was strong and had the instrument setup with too high of gain, resulting in scale saturation.

Special sources 1 and 2 were studied.

The special source 2, a contact binary star is getting close to a supernova event in a few years, and we want to baseline it and get ready to observe the supernova emission.

To find objects Gary used the tables in Rich’s observing guide and in the Data Book  “Astrophysical Data: Planets and Stars” by Kenneth R. Lang.

The V notch object that Tony studied was not tried in Rich and Gary’s session.

Galaxy Observations:

Rich and Gary also did an experiment to measure the hydrogen (HI) Line Doppler shift and therefor the velocity along the galactic plane. They were able to get reasonable hydrogen measurements of the galaxy’s rotational velocity at multiple points from the center out to the radius of the sun.

Rich plotted these observations and got a curve that is in the ballpark but a little different than the published data on similar measurements.  This is the first time that the Galactic angular velocity measurement has been attempted with the 60 ft. dish.

 

See Dr. Rich Russel’s attached Science Meeting presentation for more detail on the site trip and the observations mentioned above.

DSES Science Meeting Presentation October 22, 2018 [Please click to view.]

 

Tony Bigbee also went to the site for the observing session last week.  Tony installed onto the system after Rich and Gary had finished.  He did not get the expected results on the RASDR 4 receiver when attached to the 60 ft. dish over the weekend.  He thought that the issue may be with the pointing accuracy of the System 1 controller.  We used System 2 at the open house when Tony had very good results but did not get the same on this last weekend’s observation session using System 1.  Tony looked for the V notch absorption object and is using a new code to calculate the source amplitude.  He did not get good results on this and suspects pointing error.

He  calculated the curves for the open house and last weekend’s observations showing time and discovered that these are different indicating that something is wrong between the two.

Tony did a Mollweide projection plot like the one below.  In Tony’s plot the green line is the meridian,  the blue line is the galactic plane.  The black X is the position of the telescope. See Tony Bigbee’s actual plot when he posts or sends it out.

Figure 1 Example of a Mollweide Projection

Rich suggests that anyone going down to observe should measure some of these same sources and get data to compare their results.

 

Skip Crilly says we have aligned NRAO 5690 at Greenbank and Haswell sites three times using the System 1 controller and it seems to be positioning correctly. Steve can do an additional observation next week, Tuesday and Wed and verify the alignment.

Another difference from the open house observation was that Steve Plock added the alternate cavity filter configuration.

As mentioned previously the coordinates of some of the sources are from celestial coordinate year 1950 epoch and year 2000 epoch so may be different positions now due to precession and galactic movement.  A mathematical correction to the coordinates may be required to make an accurate set of coordinates for the current date. However, the small difference afforded by this is probably within the capture angle of the dish.

 Glenn Davis says that his NTP time sever may be useful to improve the accuracy of the pointing systems. 

Bill Miller said that the System 1 controller may still have a discontinuous elevation reading error.  This was seen previously this summer and has not been fixed.  This could contribute to a pointing error and inaccuracy on some coordinates.

 

Additional Considerations:

Anyone going to do observations at the site should try to replicate the studies of the observation guide and use the Observation Checklist to make their session useful and comparative.

Currently the LMST is close to local time, and so one needs to consider this and observe in the evening instead of afternoon.

See the back of Rich Russel’s observing guide for dish rules and limits. An observation data sheet and suggestions are available in the back of the guide as well.

We need a list of some calibration sources to start all observing session with, to be sure that the pointing system is working properly and that it isn’t broken with new SW drops.  Also, we hope the voltages we measure from calibration sources (with known Jansky levels), will enable us to derive the Janskies of other objects we wish to observe.  Janskies are the measure of the flux density that the antenna receives.

Three papers have been accepted in the next SARA journal.

“The Deep Space Exploration Society 2018 Perseid Meteor Shower Open House”. By Bill Miller, Gary Agranat. Deep Space Exploration Society.

SpectraCyber Neutral Hydrogen Measurements using the Deep Space Exploration Society 60 – foot Antenna System“. By Richard Russel D.Cs., Ae.E.; Gary Agranat. Deep Space Exploration Society.

Dark HI Cloud Observation using the Deep Space Exploration Society Plishner 18 – Meter Dish with the RASDR4“. By Tony Bigbee, Richard Russel, Steve Plock. Deep Space Exploration Society.

 

Skip Crilly discussed his new 28 ft. antenna that has a 5 pixel or 5 separate antenna segment feed and is mounted on a cargo trailer but will be used mostly for SETI.  The antenna may not be large enough to observe the strange signals we have seen.  File size is one challenge since it is inversely proportional to the gain and noise ratio.

 

Meeting was adjourned after much secondary discussions not captured here.

 

 

Old 9/24/2018 Agenda and Notes from last science meeting:

  • Glenn Davis proposes a graphical user interface called Astro Guide that would allow better guiding and tracking of radio sources.
  • Rich’s presentation and overview of the radio astronomy guide
    1. Started with Floyd’s list
    2. Added the 1420 MHz sources from the book “Tools of Radio Astronomy” by K Rohlfs and T Wilson.
    3. Added the hydrogen measurements from K5SO, Dr. Joe Martin who has provided signature images of the objects.
  • Gary, Jay Wilson, Rich and Steve all went to the site on 9/22 and did observations using the 60 foot dish.
    1. Used Spectra Cyber
    2. Used system 1 pointing
    3. Used the new setup with the cavity filter
    4. Limit switches are set at +/-15 ether way of north. CCW to 345.  CW to 015.
    5. Gary got great pictures of the event.
    6. Need screen print capability to capture the Spectra Cyber parameters display.
    7. The Spectra Cyber SW is easy to take the data and use it.
    8. Need a Lap Top with a com 2 serial port to attach the spectra cyber. This is difficult because most of the Serial to USB port adapters don’t want to set for Com1 or Com2.
    9. Need to do calibration sources before and after observation of an observed object and keep all settings on the Spectra Cyber the same.
  • From Tony, “To avoid problems of solar interference all observations were made between sunset and sunrise. Most scans were taken with the telescope on the meridian.” Galt and Kennedy, 1968,  ‘Survey of Radio Sources Observed in the Continuum near 1420 MHz, Declinations —5° to +70°’ http://adsabs.harvard.edu/abs/1968AJ…..73..135G
  • Rich presented a number of plots from their observations. See Rich’s report.
  • The scan across the galaxy were at one RA. The radio hot area was offset from the optical.
  • The galactic rotation rate was also observed.
  • Got a lot of raw data, learned how to catalog it and analyze it.
  • The calibration sources did not show any signal above the noise.
  • Got good data for Sagittarius A, SAG A.
  • 3 Papers have been submitted for the SARA Journal.
  • The Western SARA conference is in Boulder in March.
  • Next Observation Trip. Need a couple of nights.

Plishner Site Report for the Weekend of October 19-21, 2018

This is a summary of our activities at the Plishner radio telescope site during the third week of October 2018.  Steve Plock, Ed Corn, and Gary Agranat contributed to this report.

Participants this weekend were Gary Agranat, Paul Berge, Tony Bigbee, Ed Corn, Hans Gaensbauer, Dave Molter, Steve Plock, and Rich Russel.

Our plan for the rest of the year is to work at the site during the third weekend of each month.  The Friday evening is devoted to astronomical observing, and the rest of the weekend is then devoted primarily to infrastructure and equipment work.

60-foot Antenna Observing, by Gary Agranat, WA2JQZ

On Friday afternoon and evening Rich, Gary, and Paul did 1420 MHz neutral hydrogen observing with the 60-foot antenna.  The primary observing goal was to take regular measurements of the hydrogen signal along the Milky Way galactic plane at 10 degree intervals, from the galactic center to about 110 degrees (a little more than the first quadrant).  The Doppler shift of the hydrogen was measured at each 10 degree point. From that, Rich later used some basic geometry to derive a velocity and distance from the galactic center for each measurement.  A second goal was to observe several known, strong galactic radio sources that could be used in the future for calibration of our observations, and also to see if we are capable of observing those sources in a consistent way (without unknown biases).  A third goal was to observe additional galactic sources as targets of opportunity, to see how well we do, and to also see what problems we hit.

Galactic plane observing started at about 5 pm local time, when the galactic center in Sagitarius had risen high enough in the sky for us to observe. The galactic plane and most of the other observing were done with the 60 foot antenna pointed along the meridian (180 degrees azimuth to the south and zero degrees to the north), in order to eliminate the Earth’s rotational motion in the Doppler shift measurements.  We observed until about 10:30 pm, when the team was then quite tired. To warm us up during the evening, we made a batch of hot apple cider.

Details of the observations and results were discussed at the science meeting on Monday October 22nd, and those will be covered in a separate post.

– Gary WA2JQZ

60 foot dish antenna on Friday late afternoon, as the galactic plane observations started.

 

We’ll continue with the discussion of the weekend infrastructure work.

Saturday Infrastructure Work by Ed Corn, KC0TBE

Our first order of business was to re-service the toilet and spare in the outhouse. They now both have RV antifreeze for winter. Next installed was a portable heater for winter operations and I labeled all the breakers in the out house. I then labeled the doors with instructions for emergency exit and the safety pin for privacy at the main door.

With the help of Gary, Hans, and Paul we have the first 3 tower sections in place at the bunker, along with the first set of guy wires. [More about the tower below.]

-73’s Ed KC0TBE

DSES Site Work Report by Steve Plock KL7IZW, DSES President

Paul Berge worked on Friday, Saturday and Sunday. Because he travels  from Lyons, Co. he prefers to maximize his efforts each visit. Also the weather window for the year is closing. I attempt to support his efforts as best as I can. Paul provided support for Rich Russel’s data acquisition which included galactic Doppler measurements. The team  knocked  off before midnight.  Results have already been detailed in the  Science meeting on 22nd of October.

On Saturday Ed installed a heater in the outhouse, winterized the RV toilets, and labeled the outhouse breakers.

During Saturday afternoon Hans, Ed, Paul, Steve and Gary all worked together to erect the new communications tower. The first set of guys were finished  at 23 ft. by Ed Corn doing all the climbing.   The majority of the rest of Saturday myself  and Paul spent evaluating the elevation limit switch operation, including testing complete functionality with fault clearing via the built in override capability.

Later that day, Tony Bigbee showed up, and Paul and Steve supported subsequent  hydrogen observations using the RASDR4 receiver.

The majority of Sunday was consumed by lubrication of the dish and adjustment of the azimuth drive chain. I also installed the conduit in the elevation bulkhead so that Bill Miller can complete his synchro  wiring project.

Sunday Dave Molter worked into the night using the 500W floodlights and mixed over 1000lbs of concrete to try to prevent continued erosion in the ramp area.  A big thanks to all who participated in  this cooperative effort.

– Submitted by:  Steve Plock,   President DSES

Photos by Gary, from Friday and Saturday:

Position of the 60-foot antenna as it is pointed due south, at 180 degrees azimuth along the meridian.

The Moon with the 60-foot antenna.

View from the base of the dish antenna, looking towards Haswell.

Haswell as the sun set Friday evening.

Pikes Peak and Cheyenne Mountain were visible on the horizon, about a hundred miles to the west-northwest.

Work Saturday morning at the outhouse.

Work at the outhouse, including labeling.

Hans helping Ed unload tower sections and a jin-pole, for building up the ham radio communications tower at the bunker.

The first section of the tower had already been installed during the last work trip. Here Ed is safely secured to the tower after the second section has been hoisted with the jin-pole, which is also temporarily securely attached to the tower. He is fastening the bolts of the second section on to the top ends of the first section. He did this again with the third section.

Ed fastening the bolts of the second tower section on to the top of the first.

The team standing ready as Ed works on the tower. Hans is standing by the third tower section.

The tower at left with the third section up. A 6-meter delta loop antenna was hung from the tower to the doghouse. Stainless steel guy wires were also extended from the third section, per tower specifications.

Hans, Paul, and Gary installed supports for the guy cables, at one-third intervals around the tower.

Hans and Paul securing one of the guy wires at the ground support.

Configuration of the tower with 3 sections, until work resumes next time. The current plan is to install one more section with a rotator. The rotator shaft will have at least a triband HF yagi antenna and a 6 meter directional antenna for meteor scatter. Also, small horizonal supports will be added to support the 80 and 160 meter dipoles, currently supported at that position with a pole.

 

DSES Plishner Site Work Trip Report September 14-16, 2018

Here is our report of our work trip at the Plishner radio telescope site in Haswell, on the weekend of September 14-16, 2018. Opens as a PDF file. Illustrated with photos.

DSES Plishner Site Work Trip Report September 14-16, 2018

By Bill Miller and Gary Agranat.