CQ160M Port at Bryce Mt.
Last week I had to trade my last FT-990 for a FT-1000. I left it in the car so I could try it out portable at Bryce this year. The Bryce family reunion often falls on the weekend of the Jan VHF contest (ARRL VHF??) but this year we came during the weekend of the CQ WW 160M CW test so it would probably be a good test, the probelem would be to get an antenna up that would actually be heard out of the valley where the condo is located. After reading some of the collected articles on the web I chose what I hoped would be a workable and easy portable anteanna I could put up for one time use. The antenna was origanilly described by G3YCC and I found it in a nice collection of articles at http://www.iw5edi.com/ham-radio/?a-practical-antenna-for-160-metres,32 A few weeks ago I had picked up a set of fiberglass poles and they were about the same diameter as mentioned. I also had a nice roll end of 22ga. teflon wire that I thought would have enough wire on it. I measured out 140 feet of wire in the driveway and put a paint mark at 70 ft and 140 ft. Later it turned out I could not find the paint marks in the low light, tape may have been better or a differnt color of paint. The idea was to put 70ft of wire on an 1.5" fiber pole with 1/2 inch pitch. I ran out of pole before I got to my paint mark but I thought I would be close. I left about 15ft of wire at the 'lower end' to attach to the feedpoint as I thought there might be a 2nd story balcony and I would operate from the ground floor. For feedline I used an old piece of coax from my R7 Vertical that had seen several years of use before being run over by the lawn mower and replaced. After cutting off the 'bad' sections there was enough for a feedline from the operating position to the base of the antenna maybe 25 ft or so with a 'PL" still on one end and bare ends on the other. This was some sort of 'MiniX' type cable and it would work fine. I left the spool end of the #22 teflon wire connected to the top of the pole and then I could deploy the top hat part of the antenna quickly. I had about 8 mast pieces but only took the one with the coil and three others for a height of 12 ft or so plus the piece with the coil on it. We arrived at the condo with about 45 min of daylight left so the first task after unloading was to errect the mast and get the antenna hooked up. The 4 mast sections were assembled on the balcony and the lashed to the corner 4x4 with a yoga strap. This was very easy so far! The lead in wire was throw over the balcony and the wire spool was dropped on the ground behind the condo. Downstairs the wire spool was unrolled but I never did see my red paint mark so I guessed at the distance. I hooked up the center of the coax to the radio and heard good strong signals so that was a good sign I thought. My original plan was to cut the spool and use another piece of the wire for a counterpoise but then I remembered I had a 10M dipole that I had put 'extensions' on using some of the same wire so I used these two 50ft or so pieces as the counterpoise. The auto tuner would not tune it right away. and I could not really get a good reading anywhere. After shortening the antenna a few times the SWR went to below 2:1 and the tuner seemed to deal with it OK, as it was now snowing hard we accepted this setting for the remainder of the weekend. This is where more time spent improving the match might have improved the effiecney. I never really did find a resonance point but it did take power on every band 160 through 10 M so the antenna can at least be used to some degree on other bands with a tuner.
Disaster strikes in the form of a 'major equipment failure' during the wee hours of the 1st night of operation. About 1:30 AM local time the Main VFO knob started to become difficult to turn after only a few more revolutions it 'locked almost solid' the knob was now slipping on the main shaft and I could feel and hear the set screw tearing into the shaft. It was so tight that I was able to turn it back and forth and force the knob loose with out loosening the set screw which I did not have an allen wrench for. Looking up the service manual I did not see anything that could have come loose inside the optical encoder so I grabbed the shaft with a pair of pliers and was able to turn the shaft a bit but it was starting to turn the whole encoder it was so tight! I was in a panic as I could not get the radio to turn....I wondered what might happen if I put a drop of oil on it? I remembered that the condo next door there was an open bottle of Olive Oil so I applied a drop with the tip of a small screwdriver and turned it slightly with the pliers again, it was barely moving but after a few seconds it felt like it was getting easier to turn with the pliers. Another drop and it was even better after the 3rd drop it was starting to be a bit easier but I could still not turn the encoder with my fingers. The knob was replaced by hitting it with my hand and forcing it it back on as the set screw had not moved. Turning it it with the knob a few turns and suddenly it starting spinning freely! I could not believe that 3 drops of Olive Oil had totally fixed the bearing on the encoder. It worked fine for the rest of the weekend.
The Antenna was working and contacts were made untill about 1AM local time. Both nights I slept between about 1 or 2 AM loacal time and set the alarm for about 4:30AM to catch the morning greyline. I heard some signal enhancement but it was not as noticable as last year's event but I was portable and my contact count was up over a hundred by Sat. evening. The second night was a bit slow going tried some CQing but only a very few calls so went back to S&P looking for some new stations.
CQ160CW Score Summary Sheet
Band QSOs Pts Sta Cty
1.8 136 311 31 0
Total 136 311 31 0
Score : 9,641
Not bad for what is probably about as effiecent as a 'rubber duck' on the 160M band. Good number of Q's up to a range of 1000 miles or so in a valley with the only open horizon window only a few degees wide to the south. It will be interesting to try this antenna again with a bit more tuning and in a 'better' location. It did seem to work about the same as my 'Alpha Delta Twin Sloper' thrown out the 3rd floor window.
No comments:
Post a Comment