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Old 20th Nov 2017, 8:56 pm   #161
Philips210
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Default Re: Magnetic Loop Receiving Aerial (Gary Tempest)

Hi Bazz.

Thanks for your kind comments.

So far, I've only conducted the tests with my Hacker Helmsman but will see how it performs on many valve sets including my 1937 Pilot U385 and the Pye P93 W/U.

I don't have any specific interest in the HF bands so I'm just an occasional SW surfer I guess. I found that there was some MW breakthrough on the SW bands, perhaps a HP filter fitted to the SW aerial socket on the Hacker might improve this.

I'm also interested in seeing the results if the loop is rotatable. That will I'm sure give improved results. I like your suggestion of using the blue alkathene water pipe for the aerial. I'm having thoughts of rigging up such a setup on my garage roof which will be conveniently close to my workshop.

Regards
Symon
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Old 20th Nov 2017, 10:41 pm   #162
Bazz4CQJ
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Default Re: Magnetic Loop Receiving Aerial (Gary Tempest)

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Originally Posted by Philips210 View Post
I like your suggestion of using the blue alkathene water pipe for the aerial. Symon
Yes, and as Wrangler pointed out, using the coax braid as a shield (grounded at one end) and the core as the antenna, should be very interesting for reception on long/medium wave.

I've been spending some time searching Google; lots of interesting stuff about using loops as transmitting antennas on the HF bands, but it looks very much as though tuning is best done with a vacuum variable capacitor and my junk box is sadly devoid in that department .

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Old 21st Nov 2017, 12:36 pm   #163
Philips210
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Default Re: Magnetic Loop Receiving Aerial (Gary Tempest)

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Originally Posted by David G4EBT View Post
To all accounts, the 2N3866 appears to be a candidate worth considering if 2N5109s aren't readily to hand, but to date, I've seen no actual results from anyone who has built a loop using alternative transistors (or indeed, using 2N5109s).
Well I have proved the loop aerial amplifier works fine with 2N3866s (4-247s) and the originally specified 2N5109s. I've verified the PCB version of the amplifier also works well. (see post #144)

Symon.
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