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- Newsgroups: rec.radio.shortwave
- Path: sparky!uunet!munnari.oz.au!spool.mu.edu!umn.edu!csus.edu!netcom.com!crisp
- From: crisp@netcom.com (Richard Crisp)
- Subject: Re: How to get a FM sub-carrier radio?
- Message-ID: <1992Dec30.150650.4720@netcom.com>
- Organization: Netcom Online Communications Services (408-241-9760 login: guest)
- References: <1992Dec30.140523.19084@ucc.su.OZ.AU>
- Date: Wed, 30 Dec 1992 15:06:50 GMT
- Lines: 22
-
- In article <1992Dec30.140523.19084@ucc.su.OZ.AU> dapeng@ee.su.oz.au () writes:
- >Can someone tell me where can I buy a FM sub-carrier radio,
- >or how can I build one (modify a normal FM radio?
- >
- >Many thanks.
- >
- >Dapeng
-
- I suggest modifying an existing radio that you have the schematic. Basically
- you need to tap the output of the FM demodulator (discriminator). I use
- a small capacitor (approx 50 to 100 pF) to tap this signal. I then send it
- out the radio via coax cable into the antenna input of a receiver capable
- of tuning below 100khz. If you are listening to broadcast band SCA, then
- the second receiver will need to have an FM demodulator. I use an NRD525
- or 535 for this purpose. If you are listening to military wideband FM, then you
- will need to put the second receiver in SSB mode.
-
- Good luck!
-
- --
- Richard Crisp Cupertino, Ca. crisp@netcom.com
- (415) 903-3832 wk (408) 253 4541 fax
-