Work trip report by Bill Miller.
Trip report and photos by Gary Agranat and Bill Miller, with contributions from the rest of the team.
We traveled to and worked at the Plishner radio telescope site during the weekend of July 20 to 23, 2018. Attending were: Steve Plock, Ed Corn, Paul Berge, Bill Miller, Dave Molter, Gary Agranat, and Tony Bigbee. This is a summary of what we did:
– The site received several days of heavy rains during the previous week. The bunker sump pumps were overwhelmed and the bunker was flooded. Steve and Paul spent a number of hours on Friday and Saturday morning clearing out the water and cleaning up. Steve reported clearing at least 60 gallons of water. Dave later on Saturday also spent time removing water and cleaning. Paul cleaned up some more water on Monday morning.
– On Saturday morning Paul and Bill filled in the conduit trench for the synchros.
– Ed installed a conduit and the power cables from the pedestal to the outhouse. He also started to install the cables from the outhouse that will lead to the RV power risers and connections. Ed said he intends on the next site trip to put in breakers, extend the wires to the RV locations, and install the outlets there.
– Paul put in wiring to the limit switch system, for azimuth and elevation limits of the dish travel. Paul stayed over Sunday to complete more of this.
– Paul and Bill installed the synchro indicator panel and reinstalled the manual dish steering control panel in the rack, in the com trailer. The panels in the rack will still need to be moved down one U space, to accommodate Skip’s TM-4 timing control. The Spectrum Analyzer was moved over to the adjacent rack. Paul installed the limit switch control panel under the manual control panel in the rack. They redid the panel configuration so that all the panel controls have azimuth on the left and elevation on the right to match convention. Bill relabeled all of the control panels to provide a more organized presentation of the switch and knob functions.
– Bill brought out the System 2 dish controller and laptop. It had worked well on the bench at home, but at first didn’t work at the site. After some frustration he called Ed Johnson and they worked through the problem. The static IP address of the computer had to be set and then the system communicated and could be tested. Paul stayed in the tower control deck while Bill drove the dish from the comm. trailer. A fairly serious problem was found and Ed was consulted again by phone. The watch dog timer was apparently timing out and dropping the power to the motor drives about 3 times a second. Seeing this they immediately shut it down. Bill took the system home to do a modification on the VFD power enable relay and to trouble shoot the reason for the time out. Once fixed, he will bring it back for more testing. Bill informed Dave Molter of the problem and asked that he not repeat the same issue in the motor drive control circuits of System 1. Bill also provided Dave with a linear power supply and some parts to complete System 1 controller.
– Bill also installed the latch on the System 2 Controller and temporarily installed the DB25 switch boxes in the control deck so we can switch between systems for test and maintenance.
– Steve and Gary worked on installing the MFJ auto-tuner for the FT-897 ham transceiver in the bunker. They found that the tuner would not power up, although the manual indicated that it should have. There is an alternative way to directly power the tuner, but they didn’t have the proper wiring. Steve gave Gary a wire on Monday, which can be used to connect the tuner directly to the power supply (located lower on the bench below the rigs). Gary also brought the mini-manual for the FT-897. It is like a checklist, and is useful for quickly finding menu settings.
– Gary used Dave’s antenna analyzer to check the SWR across the ham bands for the 5-BTV vertical antenna we installed by the bunker. The results show that the 10 and 15 meter bands are tuned well. The 20 meter band is biased towards the low end, with 14.0 MHz at an SWR of 1.4 and 14.350 MHz at an SWR of 2.8. The 40 meter band is biased towards the high end, with 7.0 MHz at an SWR of 3.1, the minimum of SWR 1.5 at about 7.23 MHz, and 7.3 MHz at SWR 1.8. 80 meters is tuned to a best frequency of about 3.9 MHz (SWR = 1.8), with a probable usable range from 3.87 to 3.947 MHz (where the SWR reaches 3.0). Gary noticed one of the smaller radials for the vertical broke in the middle. Perhaps it had been set a little too tightly.
– After checking with the analyzer Gary did some operating through the afternoon and evening on 10 through 40 meters, mostly on FT8 digital mode and some SSB on 10 meters. He was able to tune on the digital portion of all of those bands with his FT-950. During that time he made about a hundred contacts, which give the club some exposure to the ham community. As of this writing, about 50 confirmations were received on LOTW and eQSL. The QRZ page counter increased by about a hundred during that time as well. Propagation was poor, so that most contacts were just around the US. We did get some DX to Germany, Italy, and New Zealand. Gary also checked into the 12:30 pm Weather Net on 146.970 MHz on the Pikes Peak repeater, which is at a distance of over a hundred miles.
– Dave Molter brought his trailer out and the crew loaded up most of the remaining surplus wood container parts for Dave to dispose of.
– Tony Bigbee came out for the first time on Sunday. Bill gave him a tour of the facility and Tony went right to work, cleaned out the pedestal base room, and sorted out a lot of the surplus hardware there. Thanks Tony, this was greatly needed.
– The Britain family from Haswell came out on Sunday afternoon. Bill, Paul, and Tony gave Mr. and Mrs. Britain and their two ~10 year old boys impromptu presentations and tours of parts of the facility. Mrs. Britain is a teacher and very interested in working with DSES on a school & student outreach program in the area.
– Dave again tried the VHF talk-in radio system (on 146.46 MHz) while coming in to the site. We had a clear contact with him from about mile marker 128 on Highway 96. Gary tried communicating through the talk-in system coming from the south from Las Animas. He contacted Ed and could be heard from the first transmission at the county line, which is on a ridge. Gary again tried talking to the system with Bill while going out, traveling north to Haswell and then west on Highway 96 past mile marker 128. Gary could hear Bill clearly along most of the route, but Bill had some difficulty hearing Gary. Bill suspects the problem may be at the audio of the phone receiver in the comm. trailer.
The team considered this a successful trip.
Gary using Dave’s antenna analyzer to record SWR (standing wave ratio) values on the 5-Band Trap Vertical antenna for the HF ham frequencies it covers.
DSES Technical and Operations Meeting Minutes, 7-09-2018
Minutes written by: Bill Miller, DSES VP and Acting Secretary
Location: IHop/IHob, Constitution Street, Colorado Springs
Attendance: Gary Agranat, Myron Babcock, Ed Corn, Glenn Davis, Floyd Glick, Dave Molter, Steve Plock, Bob Sayers, Bill Miller
Attending Remotely via TeamViewer: Dayton Jones, Skip Macaulay, Jamie Riggs
Next Trips to site:
- July 21st site work trip.
- Site work trip on an additional weekend before open house.
- Open house trip for the group on Friday, August 10th thru Sunday August 12th with the public event on Saturday, August 11th.
Accuracy: As always if I have misstated, omitted or misrepresented anyone please feel free to correct me.
- If Quorum present board vote on tower section disposition.
- Completion of outhouse project.
- Operation Briefing
- Closing of Synchro Cable Conduit trench
- Installation of RV electrical pedestals.
- Additional open house preparations.
- Tentative menu for Saturday in bunker.
- Questions and Comments
- Steve and Ed only made $40 from the Ham Radio Mega Fest in Monument after Steve spent about $50 in diesel to haul the equipment back from the site. However, this did get most of the junk out of the bunker. We still have a lot of site junk and surplus material to clean up.
- Dave got a lot of the wood that was taken down last year cleaned up around the ramp.
- We have an additional metal scrap pile in bunker needs to be cleaned out. Bill will help clean out and dispose of material.
- Myron Treasures Report
- Got $100 dues and donation from Skip at Centennial electronics
- Got $50 dues from Don Lewis
- $1383.22 in checking
- $5731.02 in savings
- If we have a quorum at the meeting, present board to vote on tower section disposition. We have all board members present in this meeting except for Dr. Richard Russel.
- There are 9 – 10ft sections of ROHM 45 in Ray Uberecken’s yard that he would like to get removed.
- We have a Rohm 25 base above the bunker and we have 2 sections of on site and 2 more sections at Ray’s house, so we can still erect a 40-foot Rohm 25 tower at the bunker.
- Michael Lowe would like to have 5 sections of the ROHM 45 for the Pueblo Makers Space. A motion was made and seconded for the Board vote on giving the non-profit the excess ROHM tower sections that we don’t need.
- The board voted to give 5 sections of the ROHM 45 to Michael’s makers space project in Pueblo. Bill later let Michael know of this decision and Michael will arrange to pick up the tower sections from Ray’s property.
- Completion of outhouse project.
- Wiring: Ed has material to hookup power to the outhouse.
- Operation Briefing: Will have a rail road exhaust fan and a red light for occupancy indicator. Will brief the group on maintenance and operation of the facility.
- The second narrow door of the small building will have a pin on the inside to allow emergency exit should the main door become jammed or blocked.
- Toilet: Ed and Steve now have the chemical toilet and the service pipe installed.
- Closing of the synchro cable conduit trench: We need volunteers next trip of Saturday, 7/21 to cover the trench in before the open house. Most who will be at the work day said they would help.
- Installation of RV pedestals.
- Will setup best locations from last year’s open house RV parking.
- The RV hookups are for 20 Amp, 120V, and no ground fault. The connection will run from the outhouse electrical connection. They are not suitable for RV air conditioning loads. The DSES will ask for a $10/night donation for RV plug in usage.
- Wiring: Will need to purchase additional materials for the RV electrical hookups. Ed, Steve and Myron will go to Colorado Electrical Supply this week to purchase the remaining material to install the RV Electrical pedestals.
- We will need to trench in the additional wires for the RV electrical permanently before winter.
- Additional open house preparations.
- Clean up garbage and scrap.
- Clean up under the comm. trailer.
- General cleanup and marking of hazards.
- Tentative menu for Saturday the 11th. Lunch and Dinner menu.
- Dave will bring the grill.
- Bill will bring the coffee mess with camp stove and another 10X10 canopy.
- Myron has been buying all the food in the past and he has had a donation pot but paying for the remainder out-of-pocket. The Board voted to cover food expense not covered by donations out of our bank account, so Myron is not stuck with the bill.
- Will have hotdogs on the grill for Saturday lunch for public.
- Steve will bring “Modified Brunswick Stew” for the dinner on Saturday night.
- Presentation for Saturday in bunker:
- Rich will provide the presentation agenda for the weekend.
- Gary will have a ham radio presentation and demo.
- Others may also present solar, and optical astronomy and other radio astronomy topics such as eddy bitty telescope.
- The pointing controls:
- System 1:
- Dave, Glenn and Bill are working to add analog power supply, motor control electronics and modified software program with tracking for system 1.
- Dave is reworking System 1 box at home and will reinstall on July 21st.
- System 2:
- Bill is working to complete software port and details for system 2 and will reinstall.
- Will add the Lenovo laptop for this.
- Dave and Bill will add 3 switch boxes to the DB 25 connections to the encoders and tracking output to make the systems selectable.
- Synchros: We have the azimuth synchro indicators working for azimuth position but still need to hook up the elevation synchros. Need a new access plate and Liquid-tight flexible conduit to route the wires from the Elevation encoder/synchro enclosure.
- System 1:
- Questions and Comments
- The GPS time base used in Skip Crilly’s SETI observations is a TN4 model from Spectrum Instruments. It has been sent back to Skip for repair or replacement before the next observation session in August.
- Need an announcement for the open house on August 11th in Eads, Sugar City, and Haswell businesses and in the Kiowa county newspaper. Need a one or two paragraph announcement for the open house.
- Ed had installed the telephone intercom and the talk in radio at the site on 146.46MHz simplex. Bill and Dave tested this on the last trip and had good audio and range as Bill drove out, almost out to Arlington on a hand held with rubber duck and good audio and copy. Great job on this to Ed! We may increase the height of the antenna when the tower is erected for even more range.
- Gary placed the announcement for the Open House on our DSES website. And he placed an announcement in the August QST and on the ARRL website about the ham radio special event station to be operated during the Open House.
- The meeting was adjourned, and Dave, Glenn and Bill spent an additional half hour after discussing the system 1. controller motor drive electronics design.
Submitted 7/16/2018: Bill Miller, DSES VP and Acting Secretary
Local Hotel information:
- Cobblestone Inn & Suites in Eads, CO (about a half hour drive): https://www.staycobblestone.com/co/eads/
I thought this might give a nice change of pace, and also be appropriate and fun. – Gary
By Larry Maurice
Why do we do what we do?
Why is it done by so few?
The answer is vague, but maybe today
I’ll try and explain it to you
We do it for the FUN!
To watch the rising sun
To see the sparrow and the hawk on high at play
To watch the mountains rise from inside a darkened sky
To feel the muscle of the earth at the break of day
Great grey granite peaks
The place where your own spirit speaks
In a language that you interpret as you choose
We do it because we know that no matter how it goes
Life is not about the goods that you win or lose
We do it because we are never at our best
When we are setting down at rest,
Like those who only sit and plan and plan
But we are most at ease
When we are part of the breeze
Pitting ourselves and our stock against the land
In our life the job is never done
We always need another sun
It’s just handled for the moment
And we thrive on life’s hard rules
And we are often spoke as fools
But in the hardest job well done
There is contentment
Most of us take great pride
In the work
And the ride
And in the smugness of being where we want to be
I hope all of you
Need and love the work you do
And if not
It’s never too late
To set the Cowboy in you free.
Grassy Lake, Jackson Meadow, 1991
This poem appeared in a guide to learn CW (Morse Code) by Ron Stark KU7Y, distributed by QRP Amateur Radio Club International.
Trip report by Bill Miller, with editing and photos by Gary Agranat.
This is a report of our work at the Plishner radio telescope antenna site during the weekend of June 16 & 17, 2018.
Attendance: Gary Agranat, Paul Berge, Ed Corn, Michael Lowe, Bill Miller, Dave Molter, Steve Plock.
Vertical Multi-band Antenna Radials: Gary performed a set of SWR (Standing Wave Ratio) measurements with an antenna analyzer on the vertical multi-band antenna, which was installed last April for the ham radio station at the bunker. He then installed 17 radials at the antenna base. On the next trip he plans to retake antenna analyzer measurements, and also do some digital radio operating, to compare characteristics before the radials were installed.
New Rest Room: Steve Plock and Ed Corn continued work on the new rest room/out house. This is a refit of one of the rail road buildings previously used for storage. They added tie down cables to prevent it from succumbing to the winds. It will be fit with a chemical toilet and there is a waste receptacle behind the building for easy dumping access. This will greatly improve our facility for public visits such as the open house on August 11th.
Synchro Installation: Bill worked on the dish Az/El Synchro installation as a simple backup pointing system for the dish. On the previous trip Bill and Steve installed an additional 2” conduit from the Comm Trailer to the pedestal. Myron had helped pull in the 15-conductor cable. On this trip Ed Corn helped finish off the conduit and drilled 2” access holes in the trailer floor and pedestal. Bill installed the cable up the pedestal structure and terminated it in the terminal box above the control deck. He also terminated the other end on the synchro panel in the comm trailer. The azimuth synchros were hooked up and they worked. One problem remains with the fine azimuth synchro. The Elevation synchro connection on the dish will be made in a future trip.
Pointing System 1: Bill and Dave examined what would be needed to complete system 1. Bill has a linear power supply in the works to replace the noisy switcher. He also has an amplifier and watch dog circuit for the control function in progress. Dave suggested removing the system 1 box on the next trip and bring it back to Colorado Springs to install these and other software modifications for Glenn to test. Currently system 1 only has position feedback and no direct control.
Pointing System 2: System 2 currently has all the circuitry for full position reporting and tracking control. As reported last time, Bill is working to transfer programs between computers and working on the system 1 at home and will reinstall on the next trip.
Dish Restoration and Maintenance: Paul Berge came down Saturday afternoon and stayed for work Sunday. Paul checked our Synchro system and made some valuable suggestions. He worked on other maintenance items on the dish including making a rubber bellows and seal to keep the water and birds out of the multiple cables feeding down through the center of the azimuth axes. He also started working on wiring and setting up the Elevation and Azimuth limit switches.
Other Items: Dave Molter finished the tear out of the 12-foot fiberglass dish and support concrete from Sue’s yard in Sugar City. He transported it down to the site on his trailer and unloaded it for future use. Bill and Dave pulled a vertical antenna and base insulator out of the pedestal and loaded it on Dave’s trailer. Dave returned the antenna to Michael Lowe in Pueblo who originally brought it to the site.
While we worked on Saturday, there was harvesting in the surrounding fields.