[Hallicrafters] Re: Hallicrafters HT-37

[kiyoinc at attglobal.net]

WB7SSN Wrote:


> 
> Does anyone have any experience with this xmitter? Does it use phasing 
> or filters to generate SSB? I have heard horror stories about phasing 
> methods to generate SSB. What I'm looking for is a transmitter to pair 
> up with my R-391 receiver, for a vintage AM/CW station. The HT-37 does 
> not have AM, but has DSB, which will work, but how well for AM?

As others have said, the HT-37 is a phasing rig and is known for its 
great audio, probably because phasing rigs pass more of the audio 
spectrum than filter rigs.  5, 6 kHz wide as opposed to 2.1 kHz.

The HT-37's "DSB" is AM.  It is not double sideband surpressed carrier. 
  For some reason Hallicrafters chose to call the HT-37's AM, DSB.

Since the HT-37 has a wide audio passband, it'll sound great to AMer's, 
just like a Ranger or Viking. Although someone "up 3" might complain.

The HT-37 is a heterodyne transmitter and not a frequency multiplier. 
So the VFO is better than a Johnson on the higher frequencies.  10 meter 
coverage is limited though. That's the trade-off, you get one 500 kHz 
band segment but you can tune 10 slow, just like 80, same kHz per turn.

Unlike, say, a filter rig on AM, you're transmitting both sidebands and 
some folk think that sounds better than single sideband AM.

I also made the CW-VOX mod.  It works very well.

And, sadly I had a power transformer short in the HV rectifier filament. 
  I bypassed that by plugging in a solid state replacement.

de ah6gi/4