[Milsurplus] LO radiation; some MEASUREMENTS

[gl4d21a at juno.com]

Steve and group:

I have read all the books you list, some recently, and I do not recall seeing any reference to the LO story in any of them.  To that list, I would add "Echoes of War" by Sir Bernard Lovell, who carefully chronicles the development of the H2S (10) centimetre radar, and mentions the Metox used for VHF radar detection and details the appearance of Naxos, the U-Boat 10 cm. receiver on P.166.  He briefly references Roskill's ("The War at Sea 1939-1945") story about Dönitz incorrect conclusions about oscillator radiation from Metox.  One wonders if this is where the LO story arose, most lay people missing the difference between VHF radar and comms.

Now, here are some measurements.  I have two WW2  vintage receivers presently functioning here, a RCA AR-88LF, which tunes 500 KHz, and a HQ-129 for HF.  Measurements of the LO amplitude at the antenna terminals (no attempt at matching) are:
RCA tuned to 500 Khz, LO at 1235 kHz :-88 dBm
HQ-129X at 7 MHz, L. O. at 7.455 MHz: -68 dBm

The RCA on HF varies from - 48 dBm to -70 dBm

Now, some of you with more likely shipboard hardware, how about some equivalent measurements?

73,
George
W5VPQ  

___________________________________________________________________
Speed up your surfing with Juno SpeedBand.
Now includes pop-up blocker!
Only $14.95/month -visit http://www.juno.com/surf to sign up today!