[ARC5] Anyone collected sets or information on 1950s, 1960s avionics?

[Bob Groh]

Scott, definitely not the ARC-44 et al but certainly the ARC-145 et al. I
was working at Sylvania Electronics Systems in Willamsville, NY (just
outside of Buffalo, NY) from 1964 (first job after graduating from Syracuse
University with my BSEE) to 1967 (when I was laid off in the 3rd wave of
massive layoff's at the company) and stumbled across the ARC-114 family
which was being developed in one of the upstairs labs.  And I am pretty
certain that (at least in Sylvania) the program was called LOHAP.  I was
not working on it (I was doing microwave satellite work at the time) but I
was always curious and would wander around at lunch time asking questions
and looking at stuff and I saw this incredibly small (at the time) UHF
synthesizer (about the size of a cigarette package) - that was a 'WOW' for
me and I got a chance to see some of what they were working on.  Very neat
stuff.

Anyways as I mentioned I just decided to see what others in the forum could
throw my way.  Guess I am still a curious guy.

Bob Groh, WA2CKY

On Sat, Sep 12, 2020 at 11:37 AM Scott Johnson <scottjohnson1 at cox.net>
wrote:

> It also occurred to me you may have been talking about the earlier ARC-44
> FM, ARC-45 UHF and associated interphone.
>
>
>
> Scott V. Johnson W7SVJ
>
> 5111 E. Sharon Dr.
>
> Scottsdale, AZ 85254-3636
>
> H (602) 953-5779
>
> C (480) 550-2358
>
> scottjohnson1 at cox.net
>
> scott.johnson at ieee.org
>
>
>
> *From:* arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> *On
> Behalf Of *Scott Johnson
> *Sent:* Saturday, September 12, 2020 9:32 AM
> *To:* 'Bob Groh' <bob.groh at gmail.com>; arc5 at mailman.qth.net
> *Subject:* Re: [ARC5] Anyone collected sets or information on 1950s,
> 1960s avionics?
>
>
>
> LHA? (Light Helicopter Avionics?  ARC-114 VHF-FM, ARC-115 VHF-AM, ARC-116
> UHF-AM and (I think) APX-68 IFF.
>
>
>
> I think it was designed in part at Ft. Monmouth in the late sixties, and
> deployed on many platforms.
>
>
>
> It seems to have perhaps pushed the technology envelope a bit too hard.
>
>
>
> The ARC-114 and 115 seem to be rather robust , but the 115 was unreliable,
> and late in life was fitted with a revised PA module.
>
>
>
> The ARC-164, ARC-186, and APX-100 obsoleted it in the late seventies/
> early eighties.
>
>
>
> That exhaust my data banks
>
>
>
> I have repaired the equipment in the past, when I owned an FAA Avionics
> repair station.  Customers were principally government contractors flying
> ex-government aircraft.
>
>
>
> Scott V. Johnson W7SVJ
>
> 5111 E. Sharon Dr.
>
> Scottsdale, AZ 85254-3636
>
> H (602) 953-5779
>
> C (480) 550-2358
>
> scottjohnson1 at cox.net
>
> scott.johnson at ieee.org
>
>
>
> *From:* arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> *On
> Behalf Of *Bob Groh
> *Sent:* Saturday, September 12, 2020 8:14 AM
> *To:* ARC-5 Maillist <arc5 at mailman.qth.net>
> *Subject:* [ARC5] Anyone collected sets or information on 1950s, 1960s
> avionics?
>
>
>
> I was having one of those random thought threads the other night -
> thinking about my engineering design work during the 1960s working on
> radios that were part of the LOHAP avionics (LOHAP was short hand for (I
> think) 'Light Observation Helicopter Avionics Program'). The radios (sorry,
> but I don't remember any of the radios nomenclature) were all solid state,
> mostly analog being somewhat prior to widespread digital circuitry and
> quite small for the era - I sort of remember one of the radios being a UHF
> AM radio, frequency synthesized, etc. Neat stuff.
>
>
>
> Anyways I just wondered if anyone is collecting gear like this or has
> looked at the systems, etc.
>
>
>
> Bob Groh, WA2CKY
>
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