[AMRadio] HRO-50

Mike Sawyer w3slk at hughes.net
Mon Nov 26 17:48:22 EST 2007

Thanks, Larry. I'll see if that helps.
----- Original Message ----- 
From: Larry Will 
To: Discussion of AM Radio in the Amateur Service 
Sent: Monday, November 26, 2007 5:38 PM
Subject: Re: [AMRadio] HRO-50


My book indicates, like many National receivers, on D band a single 
loop of wire inside of the coil is bent to add/subtract 
inductance.  I just looked at my RF input coil (opened it up) and 
there is the wire.

The wire is accessible through the left rear hole, looking from the 
top of the assembly (the side with the contacts).

Se page 19 in the HRO50-1 National manual for all the coils.

I have seen some cases on some receivers (not an HRO-50) where the 
range may not be sufficient.


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