ARYEH Posted February 14, 2019 Share Posted February 14, 2019 (edited) Hi: Most interesting book about the cat and mouse conflict between the Polish Underground's Radio operators and the German Radio Detection/Direction Finding units in occupied Poland. https://https://archive.org/details/fightingwarsaw001906mbp/page/n6 On a few occasions the book relates that the Polish operators could tell that the vans were near by hearing a screech in their headphones. I read that the Gurtelpeiler was a superhet that had a regen stage. I dont know about the Kapsch R30 and the Kapsch Kofferpeiler. The Polish Transmitters were in the 40m band. Their equipment was home built and they used separate transmitter and receiver - later on they received equipment that was parachuted to them by RAF etc I have not read other accounts about Partisan Radio units in Occupied Europe being able to hear their hunters equipment. (see hearing.pdf) Any ideas? hearing.pdf Edited February 14, 2019 by ARYEH 1 1 Link to comment Share on other sites More sharing options...
val Posted February 14, 2019 Share Posted February 14, 2019 @ARYEH - your link still doesn't work . there are dots inside. Link to comment Share on other sites More sharing options...
ARYEH Posted February 14, 2019 Author Share Posted February 14, 2019 val IT does now just checked it. Thanks Link to comment Share on other sites More sharing options...
val Posted February 14, 2019 Share Posted February 14, 2019 @ARYEH - BTW, regarding your question about W.Anz. - see this link: http://www.ab4oj.com/nsprog/german_sigint.pdf Especially page 16 - there are images. Fu MB 9 Wanz g 2 manual you can get here: http://www.cdvandt.org/manuals.htm Link to comment Share on other sites More sharing options...
ARYEH Posted February 14, 2019 Author Share Posted February 14, 2019 val Thanks for info. I have the Trenkle book that ab4oj took images from but no info on the HF version. Same goes for CDVANDT. BTW updated my post. Link to comment Share on other sites More sharing options...
tornfuté Posted February 14, 2019 Share Posted February 14, 2019 The germans avoid use of superheterodyne for marine use in early time as it’s possible to detect the small signal generate by the local oscillator but later they stop and use T9k39 or E52. about the polish use of tx or rx , i suppose they use 2 different antennas or they have a break in system that connect antenna to rx or tx,with one antenna.as when they are sending they can’t hear anything ,the dangerous moment is during the sending ,fix station search first ,then vans , and when they are near tx in a hundred of meters they use gurtelpeiler, meaning that they are near the goal, when using a soe set like b2 you need to pass from tx mode to rx by switching the antenna switch ,so hearing a -screech will be difficult as it can happen during time you send or when switching. Later the nelka serie of polish set were fitted with a breaking , in this case directly after you stop sending the receiver is automatic activate. it’s what i guess , as i never hear that it’s possible to know if the ennemy is hunting you.About wanze i believe it’s used for tracking radars signals in 200 mhz band but not for 7mhz band spectrum analyser were rare at this time. i know there was an american device that is connect to a receiver and allow to measure the tx frequency,it’s a war time unit. I have it somewhere. Link to comment Share on other sites More sharing options...
ARYEH Posted February 14, 2019 Author Share Posted February 14, 2019 Thanks for reply. Spectrum analyzers were rare but it seems that Hagenuk started to develop them. in 1937 (Trenkle - Die deutchen Funkpeil-und-Horch-Verfaren bis 1945.). The Americans used a few versions of Hallicrafters Panadaptor. As for the hunted hearing the hunter .... it's a mystery and havent read about in other books. With all collections of WW2 German Radio eqpt I haven"t seen W.Anz {a,b,c,d - which I assume are HF models) and Gurtelpeilers are rare also, but a very few are in collections Link to comment Share on other sites More sharing options...
val Posted February 14, 2019 Share Posted February 14, 2019 One thing i can think of is that they used jamming - that's the screeching sound... Also - jamming works two-folded - you generate strong signal at their receiving freq to detect their set if they use superhet. Link to comment Share on other sites More sharing options...
ARYEH Posted February 14, 2019 Author Share Posted February 14, 2019 (edited) Had this on PC German Jammer.mp3 , Maybe BBC wrong about it being Italian. http://www.normanfield.com/jamming.htm Edited February 14, 2019 by ARYEH 1 Link to comment Share on other sites More sharing options...
val Posted February 14, 2019 Share Posted February 14, 2019 Yes, Gürtelpeiler is superhet. You can see it's schematics here. https://www.cryptomuseum.com/df/gurtelpeiler/index.htm Link to comment Share on other sites More sharing options...
tornfuté Posted February 15, 2019 Share Posted February 15, 2019 i visit years ago gunter hutter he show me his gurtelpeiler if i remember wel the wooden box where the coils are stowed is a replica. i must be happy as i also own a gurtel peiler it's the specimen illustrated in louis meulstee book Link to comment Share on other sites More sharing options...
ARYEH Posted February 15, 2019 Author Share Posted February 15, 2019 Pierre you are very lucky. Enjoy it 😊 Link to comment Share on other sites More sharing options...
val Posted February 15, 2019 Share Posted February 15, 2019 This is also quite interesting... https://en.wikipedia.org/wiki/Funkabwehr Link to comment Share on other sites More sharing options...
ARYEH Posted February 17, 2019 Author Share Posted February 17, 2019 (edited) Thanks Val for link to Funkabwehr. Did you read "London Calling North Pole" by Giskes - an interesting book about Abwehr/Funkabwehr and the Funkspiel in Occupied Holland? Edited February 17, 2019 by ARYEH Link to comment Share on other sites More sharing options...
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