Hello:
I am planning to sell or swap for an ALPHA 91B| or similar for my very
rare SSB package.

You will find the first SSB 1922 articles by Carson who got the SSB
patent in 1923.
The very rare 1956.special SSB issue of the PROCEEDINGS OF RADIO
ENGINEERS.
The 1954 book SINGLE SIDEBAND PRINCIPLES AND CIRCUITS by PAPPENFUSS et
al at COLLINS.
The 1995 SINGLE SIDEBAND SYSTEM § CIRCUITS also written by COLLINS
engineers including digital methods.
Plus my very clean and working COLLINS KWM 1 including power supply
and DX adapter.
This is the very first 1957 ham SSB transceiver model that made ham
history as the very first SSB transceiver used in a DX-expedition and
remember the very angry Chrustjew hitting the table with his shoe in
the UN? Because of the American spy plane shot down by the Russians.
It had a KWM-1 aboard! Less than 1500 made and rare.According to a
recent QST article.

73s de "argus"

wrote:

This is the very first 1957 ham SSB transceiver model that made ham
history as the very first SSB transceiver used in a DX-expedition and
remember the very angry Chrustjew hitting the table with his shoe in
the UN? Because of the American spy plane shot down by the Russians.
It had a KWM-1 aboard! Less than 1500 made and rare.According to a
recent QST article.

It was Nikita Khrushchev who was not a Jew, although that may just been an
unfortnate spelling error.

http://en.wikipedia.org/wiki/Nikita_Khrushchev

According to the wikipedia article, the shoe banging incident had nothing
to do with the U2.

http://en.wikipedia.org/wiki/Shoe-banging_incident

It occured on 12 October 1960.

According to

http://en.wikipedia.org/wiki/Gary_Powers

The U2 incident occured on May 1 of that year, so it is possible that it
had some influnce on the proceedings, although it was not mentioned.

The KWM-1 was introduced in 1957, so it is possible that one was aboard
that particular U2 when it was shot down. I have not been able to find any
production figures, but they may exist. At $820, it would not be a popular
rig. The average annual salary in 1957 was $5500 in the U.S., so a KWM
would be 2-3 months take home pay after taxes.

If you are trying to sell it, I suggest you contact the Collins Collector's
Society, their members would be the most likely to be interested in it an
pay you the best price.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM