[ARC5] Heathkit Folks: Early "Heath Company" Aircraft Transmitter.

[John Hutchins]

All -
is there not some person that purchased the "copy rights" for all the 
old Heathkit manuals?  He went around the web suing folks providing 
online manuals and schematics to old Heathkit products.  He just may 
have a manual, or not.  Wish I had save3d my old emails - Yahoo Groups 
has a Heathkit group try there.
Hutch

On 11/26/2011 11:14 AM, Robert Nickels wrote:
> On 11/26/2011 5:24 AM, David Stinson wrote:
>> I've recently got this little gem working, though it was pretty much operational from the start:
> Congrats Dave!     I know where there is one like it - or almost like it
> - and that's on my shelf, waiting for me to noodle it out.   However
> mine is market "HT-4", and I'm really curious now to know what the
> differences in your HT-4B3 are.
>
> I posted some pics here:
> http://smg.photobucket.com/albums/v652/ranickel/Heath%20HT-4/
>
> Also, while there's clearly a dot in front of your "6", there isn't on
> mine.   Could this mean yours was a "QRP version for battery power
> operation"?   My HT-4 uses a 6J5 oscillator driving a pair of 6V6
> finals, so 6 watts output sounds about right, assuming a 300 volt B+
> supply   The modulator is another 6V6, with the typical carbon mic - a
> typical design for low-power AM mobile ham rigs of the era.   But that
> would be overkill for only 600 mw.
>
> I've never found a schematic but it's pretty simple, although I'd
> appreciate your power connections just to compare.  Also, are you using
> the trailing or fixed antenna position (not sure what the difference
> is).    I've read that there was an "HR4" receiver but can't confirm
> that, and suspect if there is it would be a LF receiver, as the standard
> back then was for the a/c to transmit on HF and listen to the tower over
> the LF beacon transmitter.  There was also  a brief period where MF and
> VHF were used, before everything moved to the modern VHF band.
>
> 73, Bob W9RAN
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