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Crystal set loops

Graeme Zimmer <gzimmer@...>
 

Should help out quite a bit in helping hear signals in the noise or
separate stations in a congested market
What? I guess I didn't explain very well.

What I meant by "Crystal Set" is to add a diode and a pair of sensitive headphones to a FSA and see what it can pick up compared with a single conventional loop-stick.

If it's got 30db gain (as is sometimes claimed) it should be loud, even without an external antenna.

You may need to travel close to a BC transmitter to hear anything in the headphones, but it would certainly be a revealing and definitive test.

If it isn't any louder (than a conventional rod), then it would indicate that any perceived improvement would be due to added Selectivity. Or Something.


............. Zim
kevin asato <kc6pob@...>
 

Should help out quite a bit in helping hear signals in the noise or separate stations in a congested market (Los Angeles). I used to do similar using tuneable loopstick antenna coils and tuning capacitors when Radio Shack here in the States used to stock those parts in the 70s. Like any other loop antenna used in a similar configuration, like my current Terk Advantage, it will not perform miracles if the signals are not there.

73,
kevin
kc6pob


--- On Wed, 7/20/11, Graeme Zimmer wrote:

From: Graeme Zimmer <gzimmer@...>
Subject: [ultralightdx] Crystal set loops
To: ultralightdx@...
Date: Wednesday, July 20, 2011, 7:05 PM

 

Hi folks,

I've been following this Ferrite Sleeve Antenna saga with great interest.

One test I would like to see is just how effective a FSA is when
connected as a crystal set (but with no external antenna).

How much more signal does it pick up compared with (for instance) a
single ferrite rod?

This would seem to be a fairly definitive test of whether it actually
picks up more signal or not.

Regards ........... Zim
Graeme Zimmer <gzimmer@...>
 

Hi folks,

I've been following this Ferrite Sleeve Antenna saga with great interest.

One test I would like to see is just how effective a FSA is when connected as a crystal set (but with no external antenna).

How much more signal does it pick up compared with (for instance) a single ferrite rod?

This would seem to be a fairly definitive test of whether it actually picks up more signal or not.


Regards ........... Zim

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