[Lowfer] Remote loop tuner

[John Andrews]

Zack,

I have avoided diodes for switching for two reasons. First, my "alma 
mater" on 580 kHz has a FS of about 600 mv/m at my QTH, and mixing 
products are easily generated. Second, PIN diodes are usually 
characterized for operation at HF and above. I'm not sure how effective 
they are at LF.

The W1VD preamp ( http://www.w1tag.com/pix/W1VD_Preamp.jpg ) is 
excellent at MF and below, assuming that you want 50 ohms in/out and 
around 20 dB of gain.

John A.

Zack Widup wrote:
> 
> Thanks John.  That is it!
> 
> Have you tried PIN diodes for switching?
> 
> Are you using the W1VD preamp?  How well does it do?
> 
> 73, Zack W9SZ
> 
> On Mon, 29 Sep 2008, John Andrews wrote:
> 
>> Zack,
>>
>>> Somewhere I saw a circuit of a tuner for a remote loop that used 
>>> switched capacitors, I think it was eight capacitors, each one double 
>>> the previous value.
>>
>> http://www.w1tag.com/rxloop.htm
>>
>> John A.
> _______________________________________________
>> From the Lowfer mailing list
> Send messages to: Lowfer at mailman.qth.net
> To sub/unsub visit: http://mailman.qth.net/mailman/listinfo/lowfer
> 
>