[ARC5] Mrker beacon receivers BC-357, BC-1023 and the like Sensitivity

[hwhall@aol.com]

> My idea of using such a marker beacon switch as watch on the 4 meter band isn’t going to work.
> I will never get that kind of signal from remote transmitters on the band.

Maybe with a preamp before the receiver's 1st stage?

Wayne
WB4OGM

On Tuesday, October 14, 2025 at 09:50:38 AM MDT, hvandermarel--- via ARC5 <arc5 at mailman.qth.net> wrote:

Thanks for the info that came up.
 
My BC-1023 needs 10 mV ( 10000 uV ) signal to reliable switch.
I might need to fiddle some with components or the relays itself.
 
A BC-357-D I have does switch at 2500 uV
 
My idea of using such a marker beacon switch as watch on the 4 meter band isn’t going to work.
I will never get that kind of signal from remote transmitters on the band.
 
Still, nice playing with this old stuff, my units are WW2 contracts and still work.
 
I also have a BC-357 that is converted to a BC-341 by rewiring the heater circuit to 12 V.
The type plate is manually altered to 341 by scratching.
It does receive but will not switch. The relays is probably open circuit as the unit had some rust and very fine sand on the inside, like it has been in a wreck in a desert.
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