[Boatanchors] Heathkit GR-81 Long/Short Antenna Question

[Al Klase]

Hi Scott,

RTFS! (Read the schematic carefully!)

The second (short) antenna connection does not bypass the input tuned 
circuits, but rather feeds the tuned circuits from the "top" of the 
tuned secondary coil rather than via a primary winding. This circuit 
node in  high-impedance, and is appropriate for a short antenna.

&3,
Al


ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
On 8/22/2022 11:12 AM, whitebear1122 at comcast.net wrote:
> The GR-81 regen short wave receiver has separate connections for a "long"
> and a "short" antenna.  Looking at the schematic, the 'short' connection
> bypasses the input LC filtering, but goes directly to the regenerative
> detector.
>
>   
>
> Why is this?
>
>   
>
> I understand why shorter antennas are used to decrease blocking from nearby
> high power stations, but what is the electrical reason to bypass the input
> LC filtering, and run a signal directly into the regenerative detector w/o
> the advantage of some prefiltering?
>
>   
>
> I would think the potential for 'blocking' would be higher bypassing the
> front end coils.
>
>   
>
> I apologize if I asked this question before, but forgot about it.
>
>   
>
> Thanks.  73 Scott WA9WFA
>
>   
>
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