[GreenKeys] Couple Teletype Presentation Pictures

[Mark J. Blair]

> On May 15, 2016, at 22:39, Paul Birkel <pbirkel at gmail.com> wrote:
> 
> I know that it's been hard to scrub that legacy out of modern message
> transmission formats, but was never sure why that was so.  Where/when might
> one have expected to see 5-level code equipment in regular usage?

As anecdotal evidence, I'll present my AN/GRC-122B RTTY shelter: Paperwork found in the shelter suggested that it had been installed on a HMMWV in military service, before I got it and installed it on my own HMMWV. So that, at least, puts 5-level RTTY hardware on the back of a military truck at least as late as 1986. And it wasn't just 5-level RTTY equipment... it was *mechanical* RTTY equipment with a couple of TT-98 page printers and a TT-76 punch/reperf. Mechanical TTYs on the back of a HMMWV sure seems like an anachronism, but it happened.

I'll also note that a NOS radio installation kit I got for installation of AN/VRC-12 family VHF FM radio gear on a HMMWV came with a WW2-style AB-15 antenna base for the auxiliary receiver, and a metal plate to adapt it to the 4-bolt pattern of the VRC-12 family antennas. Despite the existence of newer fiberglass bolt-on AB-558/U antenna bases, there were apparently enough old ceramic WW2 single-hole AB-15 bases left in the supply chain that they bothered to make adapters to use them in HMMWV installations in the 1980s, even as the new frequency-hopping SINCGARS radios were poised to displace the aging VRC-12 family.


-- 
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/