[AMRadio] HRO-50

Larry Will lhwill at verizon.net
Mon Nov 26 17:38:20 EST 2007


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.


At 04:03 PM 11/26/2007, you wrote:
>What a pain in the scrote. The manual says to adjust the coils for the low
>end of the band, (in this case, I'm using coil set D 1.8-4.0M GC 3,5-4.0 BS)
>and there aren't any adj. available. I looked in the in each coil set and I
>can see the coil but it looks as though it was designed not to be adj. and
>I'm hesitant about attempting to adj. them. The only one that has an
>adjustment for GC is D-4. It worked well on 160 but it was damn near deaf on
>75M. I wanted to make it back to standard but its a real tough go. I should
>have left well enough alone. Well, in for a penny, in for a pound.
>----- Original Message -----
>From: Jim Wilhite
>To: Discussion of AM Radio in the Amateur Service
>Sent: Monday, November 26, 2007 3:22 PM
>Subject: Re: [AMRadio] HRO-50
>Fun isn't it Mike.  That is the way.  If there is an easier way, I would
>like to see it.
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