To: | "Michael Tope" <W4EF@dellroy.com> |
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Subject: | Re: [Amps] 10dB and propagation |
From: | R.Measures <r@somis.org> |
Date: | Tue, 8 Feb 2005 05:10:47 -0800 |
List-post: | <mailto:amps@contesting.com> |
On Feb 7, 2005, at 6:48 PM, Michael Tope wrote: ---- Original Message ----- From: "R.Measures" <r@somis.org> Yes, but I do not know where it could be found today. However, the SRI project involved heating on one frequency and comparing signal strength of a second signal on an adjacent frequency with and without the heater. This was obviously better science than what we did. cheerz, Mike
Some mornings, 20db more Tx suds produced 20db more Rx signal and on other mornings, 20db more Tx would make c. 23db more Rx signal. There appeared to be no way of controlling anything. It was: what you see is what you got, and you can't change it a jot.
Nope. Maybe a 30db amp could have done that, but a 20db amp rather obviously was not up to the job. As I see it, a homebrew 30db amplifier is not do-able without a 2160v 3Ø mains service and a forklift to help build one of the suckers. Also, some lead shielding would be a pretty damn good idea since the anode-PS would be c. 22kV @10A -- which is definitely downtown X-Ray City. Another problem would be finding some ABS or TFE owls to put on the antenna to keep birds from alighting and having their feet burned off by RF. Another obstacle would be getting a building permit to build a moat and drawbridge.
It wasn't perfect, but since the driver was a TS-830, it wasn't bothered by minor SWR like a solid-state radio would have been. If not, then his on/off ratio could have easily differed from one you measured under different conditions. The conditions were always a TS-830S driving an AB1 8170. The 830 delivered 120v-pk into the dipole. The 8170 delivered 1200v-pk into the dipole. Sometimes the 8170 delivered a 20db increase at the Rx end, and sometimes an additional free-3db showed up. And was the tuning of the 8171 fixed. gimme a break If not, he may have adjusted the tuning differently than you did (another source of possible error). Jim Day knew how to tune up a Class AB1 amplifier because I showed him how b4 he hauled it away. Basically, AB1 tuneup's done with the screen-I meter. cheers, Mike
Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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