[Boatanchors] HT-40 Question

[Rodger]

Lee,

The HT-40 was available as a "Halli Kit" or assembled.

It has a basic Pi net output and as such the harmonics will be no worse 
than any other typical class C final, in general they shouldn't be a 
problem for you but you could always add a low pass filter or use an 
antenna tuner configuration that provides additional harmonic filtering.

I have the HT-40/SX-140 setup and it is a fine little vintage station.  
On AM, it is screen modulated like many of the little transmitters and 
may need some help from an external linear amp if you spend a lot of 
time on 75 AM.  Mine tunes smoothly and although the SX-140 receiver 
leaves a bit to be desired I have used it to make a number of contacts.

I use a Knight VFO with mine since I have a couple and it is easy to 
move it to various transmitters since it has its own power supply built 
in.  Hallicrafters did make a hetrodyne type VFO (HA-5) which you could 
use with this but for typical pricing of these you could buy several 
HT-40/SX-140 stations.  So I would use any of the classic VFO's which 
will drive the HT-40 fine, the HT-40 won't supply power to the VFO so 
you should choose one with a built in power source.

Rodger WQ9E

Lee Buller wrote:
> I am looking at a HT-40 as a "small" BA transmitter. They sure look like a Knight T-60 design.  I am assuming that the HT-40 was not a kit.  I do not remember reading that Hallicrafters produced any kits.  Is this right?
>
> Also, tuning on the HT-40 looks quite a bit like a T-60 which was just peak everything for max meter deflection.  I got into trouble with the T-60 for harmonics and am not sure that I had it tuned right at the age of 15...or put together right for that matter.
>
> Experience is valuable.  Can anyone share their experience with the HT40?    Also, what VFO did people use when they did not use a Xtal?
>
> Lee - K0Wa
>
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