[GreenKeys] Optimistic but clueless seller

[Gerry Block]

I had two 1949 Peerless mic-to-grid transformers sitting in my junk box for 40 years.  Instead of throwing them out I put them on ebay and.... $1050.  God bless audio enthusiasts.  Its probably time to separate myself from my Mcintosh C20..

Gerry

    On Friday, April 23, 2021, 10:11:32 AM PDT, Nick England <navy.radio at gmail.com> wrote:  
 
 A similar Northern Radio FSK unit with similar BS about converting to a preamplifier was bid up to $600 or so. We are not the only crazy people out there. 
———
Multi-channel TTY over HF was a common thing back in the day. The Navy’s AN/UCC-1 provided 16 TTY signals in an SSB voice channel. That’s 32 using a TMC ISB transmitter. 
The TTY channels were usually “twinned” as diversity pairs. Or you could use four channels for quadruple diversity. 
http://www.navy-radio.com/rtty-mux-ucc1.htm
Nick
On Fri, Apr 23, 2021 at 11:41 AM Robert Nickels <ranickels at gmail.com> wrote:

has listed a Northern 153 dual frequency shift keyer with some 
entertaining comments:

https://www.ebay.com/itm/265133627883

The manual can be found on the TMC History site;  custom plug-ins 
determine the tone frequency and the module that can be read is for 
2167.5 Mark and 2082.5 Space, i.e. 85 kHz spacing.   The front panel tag 
shows another pair to be 2337 and 2252 Hz, also 85 Hz spacing.   So that 
would translate to 153Z12 and 153Z13 modules in this unit.

Frequency-determining modules were sold by center frequency which is 
shifted +/- 42.5 Hz  and recommended 170 Hz channel spacing at 100 wpm, 
and the output of up to 18 channels can be combined. Eighteen keyers 
would fill one rack, then of course you'd need a couple of racks full of 
demodulators on the other end, which is why Northern came out with the 
transistorized version that put all 18 tone keyers and converters in 
less than 16" of rack space:

http://tmchistory.org/NorthernRadio/Manuals/northern_230_235_tm.pdf

It would be interesting to hear what 18 FSK tones would sound like over 
HF but according to the manual, these 18-channel systems were intended 
for use on microwave or wireline circuits.

73, Bob W9RAN


______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to navy.radio at gmail.com
-- 
Nick England K4NYW
www.navy-radio.com
______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to gblock at sbcglobal.net  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20210423/8e61761d/attachment.html>