Re: [time-nuts] Cambrideg Thermionics Freq Measurements...
Cambridge Thermionic was on Concord Ave, just east of the Fresh Pond circle. The building is now a storage warehouse. They were mostly making screw-machine components by the early 60s. They had a vast array of stake-in terminals and similar stuff. Very good product, IMO. You could get damn near anything you could imagine in terminals from them, uninsulated and insulated. They also made a bunch of other electronic hardware like coil forms. Again, very good quality. The other thing they made was thermoelectric heat pumps and products using them, like small ice bath references for thermocouples. I suspect this was related to their expertise with ceramic-metal attachment. At some point (70s? 80s? 90s?) they moved someplace else and changed their name to Cambion. Best, -John Les, I do sort of remember Cambridge Thermionics. I came across their name back in the late 60's or early 70's when I first got in the frequency measurement business. I think I also remember seeing their name as a parts supplier in some WW-2 military radio manuals. Burt From: Lester Veenstra les...@veenstras.com Bert: I wonder if you happen to remember a company called Cambridge Thermionics. Located in Cambridge MA, they made ceramic slug tuned coil s but in one corner was an individual with the off air frequency measuring service. As a duty engineer up the read at WCOP in Lexington, I frequently would get calls from him to tick a dummy plug in the modulator input patch (turning the board gain down was too much residual noise), so he could measure us, and more often, to remove the carrier for a few seconds so you could measure some one co-channel. He never wanted to talk about how it did it, and absolute would not accept visitors who might learn his dark trade secrets. I had assumed that these days a GPSDO would remove the need for the monthly freq service but I guess not. I stood my last midwatch at COP and reported to the Boston Army station for induction into the USN the next morning. 73 Les Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Cambrideg Thermionics Freq Measurements...
Hello The Net: The frequency measurement division broke off, but was still in Cambridge in ~2007. I got a call from them about a 19 KHz pilot tone generator that was off freq at a FM/NCE station on Cape Cod. After replacing the Optimod ($100) xtal, all was fine. I will eventually think of that organizations name, but for now the POC was Richard. Yes, his techniques were cryptic, but I doubt if his techniques exceeded the capability of any time or freq nut's capability. I would start with a search at SBE for such freq measurement organizations. Stan, W1LE Cape CodFN41sr On 10/15/2011 10:57 AM, J. Forster wrote: Cambridge Thermionic was on Concord Ave, just east of the Fresh Pond circle. The building is now a storage warehouse. They were mostly making screw-machine components by the early 60s. They had a vast array of stake-in terminals and similar stuff. Very good product, IMO. You could get damn near anything you could imagine in terminals from them, uninsulated and insulated. They also made a bunch of other electronic hardware like coil forms. Again, very good quality. The other thing they made was thermoelectric heat pumps and products using them, like small ice bath references for thermocouples. I suspect this was related to their expertise with ceramic-metal attachment. At some point (70s? 80s? 90s?) they moved someplace else and changed their name to Cambion. Best, -John Les, I do sort of remember Cambridge Thermionics. I came across their name back in the late 60's or early 70's when I first got in the frequency measurement business. I think I also remember seeing their name as a parts supplier in some WW-2 military radio manuals. Burt From: Lester Veenstrales...@veenstras.com Bert: I wonder if you happen to remember a company called Cambridge Thermionics. Located in Cambridge MA, they made ceramic slug tuned coil s but in one corner was an individual with the off air frequency measuring service. As a duty engineer up the read at WCOP in Lexington, I frequently would get calls from him to tick a dummy plug in the modulator input patch (turning the board gain down was too much residual noise), so he could measure us, and more often, to remove the carrier for a few seconds so you could measure some one co-channel. He never wanted to talk about how it did it, and absolute would not accept visitors who might learn his dark trade secrets. I had assumed that these days a GPSDO would remove the need for the monthly freq service but I guess not. I stood my last midwatch at COP and reported to the Boston Army station for induction into the USN the next morning. 73 Les Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Cambrideg Thermionics Freq Measurements...
Les, I do sort of remember Cambridge Thermionics. I came across their name back in the late 60's or early 70's when I first got in the frequency measurement business. I think I also remember seeing their name as a parts supplier in some WW-2 military radio manuals. Burt From: Lester Veenstra les...@veenstras.com Bert: I wonder if you happen to remember a company called Cambridge Thermionics. Located in Cambridge MA, they made ceramic slug tuned coil s but in one corner was an individual with the off air frequency measuring service. As a duty engineer up the read at WCOP in Lexington, I frequently would get calls from him to tick a dummy plug in the modulator input patch (turning the board gain down was too much residual noise), so he could measure us, and more often, to remove the carrier for a few seconds so you could measure some one co-channel. He never wanted to talk about how it did it, and absolute would not accept visitors who might learn his dark trade secrets. I had assumed that these days a GPSDO would remove the need for the monthly freq service but I guess not. I stood my last midwatch at COP and reported to the Boston Army station for induction into the USN the next morning. 73 Les Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
