- Видео 3
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Pat Griffin
Добавлен 29 мар 2012
Видео
Screwdriver Antenna Foldover Mount
Просмотров 12 тыс.12 лет назад
A light-duty antenna rotator is mounted on its side and used to raise and lower a mobile screwdriver antenna Pat Griffin AA4PG
Do you have your amp on 10 m? I have the clipper now and I like it very much. I have a slot for 10 m but it’s not on 10. Maybe you could let me know if that’s too much of a job to put it on. thank you Donl K1EMW.
I tested it in 10 but never actually made any contacts. As I recall, the output was lower, as you would expect, and I think I was getting about 500 watts out. Now would sure be the time to get on 10 with great openings to Europe.
Does anyone have a schematic with the grid metering most don’t have the grid metering, would like to add a grid meter
Go here for details about this conversion. The meter circuit is in the schematic cahabatechnology.com/aa4pg/clipperton_GI7B.pdf 73, Pat
Thanks pat Now what value did you use for plate and grid meter shunts
@@frankjankovich3512 For years I have made shunts this way since measuring the value is impossible w/o special equipment and the internal meter resistance is usually unknown. Assume we want a meter to read 500 ma half scale. Wire a 9v battery, a pot and a 10 ohm resistor, and a multimeter in series (e.g., Simpson 260). Adjust the pot until the multimeter reads 500 ma. Now, take the meter you want to use, shunt it with a length, say 3 ft, of insulated coil wire, say #28, and substitute it for the multimeter. Now comes the fun part. Gradually scrape off insulation and attach the meter at that point until you get the reading you want, i.e., the meter is at center scale. This is 500 ma. Cut the wire and wind it on something such as a wooden dowel. It's insulated and DC so overlapping the wires is fine. There is free software all over the web for making a new meter face. 73, Pat
Very nice informations. PV8AL HELIO
That's a pretty slick idea
Thanks
You said it was 25 watts out and in the next breath said 20 watts out?
Mr. Pat, do you have any amps for sale. I would like to have a good condition amp that can run on 110 v and transmits around 6 to 800 watts. W4SRK
Is that a Barker and Williamson watt meter you have ???
cool man. peace from the War Shack. de N0WAR
Lame
Best idea I've ever heard. I'll look for one of these at the Hamfest in Dayton this weekend. I'm really excited about going.
Hi, Pat, a hug from the Dominican Republic, I have this Clipperton-L amplifier, 3000Watts, and I want to know how to rotate, and I actually have the radio Icom 735, which is the same one you are using in your video, If possible show a little how it is that you should start doing this. And if you know a little better Spanish, since we do not speak English. A hug and I await your answer. Thank you
Good idea, but I've always wondered about the impact of mounting an antenna a few inches above the roof of the vehicle. People have said it causes capacitance issues. I had one mounted up there for a while and eventually I moved it. I didn't think mine was getting a good enough ground. Any input Pat? BTW, I turned my volume up to 100% and can hear you just fine.
Ham Radio K0PIR I didn't have any capacitance/matching issues. I think in this case it may be the closer the better since the ground connection would be right at the car top. I have found over the years that the top of the car is the best place to mount and the bumper the worst. In the former you get a nice ground plane/countetpoise and in the latter that big piece of metal(the car) just soaks up the rf. Not a good engineering explanation but it sure acts that way
Yeah that's my thinking. The more metal under the antenna the better. I think I just had trouble getting a good ground. The SWR would fluctuate on occasions and as time went by it seemed to get worse. Thanks Pat! 73- Rich, K0PIR
Ham Radio K0PIR Yup ground is a big deal! I don't know how many times I have tracked down weird stuff and it turned out to be ground. 73 pat
Pat I would love to talk to you. Please contact me at nf7t@nf7t.us
Brilliant idea, shame about the low audio
I used a 115VAC rotor with a small 12VDC to 115VAC inverter.
This is a great idea, what antenna rotor do you use...I have had a hard time finding a 12v rotor.