HRO5TA-1
 

All:

I have a HRO5TA1 that receives fairly well, with one exception. There isnt
any BFO, and as a result, I cant read CW.

The CW OSC has no effect.

Any help?

thanks

Kevin

? No BFO? Did someone remove the circuit. Can you be more specific?

--
73 and good DXing
RX:
R-5000, SP-600 JX-6, SX-28
Ant:
100' longwire, Evesdropper Dipole

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"Kevin Gunther" wrote in message
t...
All:

I have a HRO5TA1 that receives fairly well, with one exception. There
isnt
any BFO, and as a result, I cant read CW.

The CW OSC has no effect.

Any help?

thanks

Kevin

In article , "Kevin Gunther"
writes:

I have a HRO5TA1 that receives fairly well, with one exception. There isnt
any BFO, and as a result, I cant read CW.

The CW OSC has no effect.

I assume you mean "there isn't any BFO *effect*". Things to check out:
*The BFO tube is bad;
*The BFO coil has an open winding (not likely, and defly not good!);
*The BFO coil slug adjustment is way off, so the BFO is oscillating outside
the IF passband;
*The BFO switch is bad.

I don't recall whether this radio has a product detector. If you switch to BFO
while tuned to an AM signal, do you still hear that signal, or does the radio
go dead?

BTW, I have an HRO-60 that has been hacked on and lots of things don't work, so
probably it won't help much in figuring out your problem. 73 es gud luck, Mike
K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

Mike Knudsen ) writes:
In article , "Kevin Gunther"
writes:

I have a HRO5TA1 that receives fairly well, with one exception. There isnt
any BFO, and as a result, I cant read CW.

The CW OSC has no effect.

I assume you mean "there isn't any BFO *effect*". Things to check out:
*The BFO tube is bad;
*The BFO coil has an open winding (not likely, and defly not good!);
*The BFO coil slug adjustment is way off, so the BFO is oscillating outside
the IF passband;
*The BFO switch is bad.

I don't recall whether this radio has a product detector. If you switch to BFO
while tuned to an AM signal, do you still hear that signal, or does the radio
go dead?

BTW, I have an HRO-60 that has been hacked on and lots of things don't work, so
probably it won't help much in figuring out your problem. 73 es gud luck, Mike
K.


The five wouldn't have a product detector, unless it had been modified.

I'm not even sure the 60 had one; I recall seeing an article about an SSB
adaptor that fitted in the socket intended for an FM detector, though perhaps
I am misremembering the HRO model.

I thought there was an HRO or two that did not include a BFO. Intended
for some specific use, it was a semi-custom version. I thought I had
read something about this, but like many things, I sure can't remember
where.


Michael VE2BVW

In article ,
(Michael Black) writes:

The five wouldn't have a product detector, unless it had been modified.

Uh-oh, dyslexia, reading what you thought you saw instead of what was there. I
read 05 as 50. Nope, I wouldn't expect a PD in that vintage rig!

I'm not even sure the 60 had one; I recall seeing an article about an SSB
adaptor that fitted in the socket intended for an FM detector, though perhaps
I am misremembering the HRO model.

You are right. My 60 has an accessory socket for the NBFM that National was
promoting as an alternative to AM back when SSB was new, and yes, a previous
owner built/bought an SSB box and plugged it in there.

I thought there was an HRO or two that did not include a BFO. Intended
for some specific use, it was a semi-custom version. I thought I had
read something about this, but like many things, I sure can't remember where.

National did make special models for the FAA (CAA), etc., leaving off or adding
some feature. Maybe the original poster has such a set. 73, Mike K.




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