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Michael Coslo · March 5th 07, 03:20 PM posted to rec.radio.amateur.moderated

wrote:
On Mar 5, 3:26 am, Mike Coslo wrote:
wrote groups.com:

The simplicity was what attracted me to them. No filters, nonotch,
no pbt, no RIT, no - well you get it.

Note that the
75 meter one stops at 3.8 MHz. Heath figured that by
simplifying the output pi network to the most extreme degree,
they could save a few dollars. Coming up with a 50 ohm
antenna was the ham's problem.
The 75 meter rig I have tunes to 4 MHz. It's also a HW22a, probably a
later mod. But all that simplicity is a good thing for a lad raised
mostly on integrated circuits! 8^)

The 75m transceiver is the HW-12A. It runs 3.8-4.0 MHz. That's all
the phone band there was back when the rig was produced.

Thanks for the correction Dave. I should have looked at the back of the
unit when I was composing my email

There's a
mod in one of the mags--CQ, I think--that puts in a fixed silver mica
cap with a little trimmer cap in parallel for making the thing work on
both 3.8-4.0 and 3.7-3.9 MHz at the flip of a mini-toggle switch.
That'd give you a bit more room to roam.

Now there is serendipity for ya! I was trying to align the thing, and
having some trouble with the top end. And the unit had this extra switch
on the front. Since I couldn't find the schematic for the "a" version, I
wasn't sure if that switch was part of th ea version or not. Preliminary
looks made me think that it might have been something to lower the
frequency down to the CW portion of the band. But it looks as if my rig
has that mod .

In it's era, the TS-830 was somewhat of a DXer's and contester's dream
machine.
That receiver has an extra filter slot for cascading filters. One can
still buy after market filters for it.

I can believe that it was very popular. The hybrid concept is
interesting. I especially like that you can turn the tubes off if you
just want to listen.

- 73 de Mike KB3EIA -