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I've really been enjoying the "basic loopantenna theory" post by John Crabtree, as well as the followups. The UK patent writeup mentioned there can be found at this URL, thanks to Alan Gale for

Don't want to get into a p...ing contest but thermally conductive potting compounds generally have Thermal Conductivity of 10 Btu-in/oF- ft. Normal potting materials are 2 Btu-in/oF- ft when filled

"I too share your concerns about getting heat out of a transistor when it is in potting compound." Potting compound actually helps the heat issue by creating more mass that the transistor must heat

In a message dated 08/05/2007 00:42:07 GMT Daylight Time, mcqueen_34@... writes: Potting compound actually helps the heat issue by creating more mass that the transistor must heat and providing

Whooops........ My previous posting of this looked ok when sent but a total mess when it arrived back from Yahoo. I'm not saying changing it will make my ramblings any more sensible..... but perhaps a

In a message dated 06/05/2007 23:31:54 GMT Daylight Time, crabtreejr@... writes: Re. implications of the very low radiation resisitance, even at say 1 MHz - that should be the subject of another

gains are always positive so -33 + (+7) = -26 db to be overcome therefore positive 26 dB gain is needed is the way I am looking at this Paul

toddroberts2001@... writes: Think of the loop element and amplifier as a complete system. With the components as described, the amplifier ne

In a message dated 5/6/2007 6:32:18 PM Eastern Standard Time, crabtreejr@... writes: Re the amplifier gain. If the antenna factor were unity, ie the antenna output were 1 volt into 50 ohms for a

writes:

N apologize for the interleaving answers and further questions P

Dear Nigel Is it absolutely confirmed there were only 2 transistors in the autopsy? best wishes Paul >>> At first I had some doubts as the posted photos seem to show more than two transformers but

In a message dated 06/05/2007 04:41:30 GMT Daylight Time, crabtreejr@... writes: AFAIK no schematics for the Wellbrook have ever been published. However the harware content which was discussed

wrote: Hello Adam, What went wrong with your old cap? 73, Dave KA3JGG

Dear John ok you are referring to Power Gain = 10 logbase10 (P2/P1) which is defined via the antenna terminology so everything is in terms of power gain ok forgot some of my limited antenna theory LOL

Dear John trying to follow most of your excellent expose via backward analysis however the voltage gain is 20 logbase10 (V2/V1) so for 27 dB we have 10^(27/20)=22.4 actual voltage ratio emitter to

Originally posted on 2007/05/05 at 8:09:04 PM Central Daylight Time One correction made. Hello Nigel, Paul et al AFAIK no schematics for the Wellbrook have ever been published. However the harware

Hello Nigel, Paul et al AFAIK no schematics for the Wellbrook have ever been published. However the harware content which was discussed here, and other information, leads me to the conclusion that the

Dear Nigel forgot that getting old, I remember that now, I remember seeing the pictures but was fuzzy on whether for sure bipolars were used I believe it was not known from the autopsy whether it was