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- Newsgroups: alt.radio.scanner
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewse!parnass
- From: parnass@cbnewse.cb.att.com (Bob Parnass, AJ9S)
- Subject: Re: 'Secure' Cordless Phones? (Repost)
- Organization: AT&T Bell Laboratories, Naperville, IL
- Date: Mon, 23 Nov 1992 13:36:05 GMT
- Message-ID: <1992Nov23.133605.9615@cbnewse.cb.att.com>
- Summary: use an AM signal generator and SSB rcvr to decode speech inversion
- References: <BxwCup.4zJ@ais.org> <1992Nov21.051911.19149@ssc.com>
- Lines: 17
-
- In article <1992Nov21.051911.19149@ssc.com>,
- markz@ssc.com (Mark Zenier) writes about decoding speech
- interted scrambling:
-
- > If you feed the spectrum inverted audio into the input of your
- > VLF to HF converter, like the one Heathkit sold, you end up with
- > a couple of SSB signals, (Or an AM signal with inverted sidebands,
- > depending on how well your mixer is balanced). Then the SSB receiver
- > works just fine.
-
- Or pipe the scrambled audio into the EXTERNAL MODULATION INPUT
- jack of an AM signal generator. Tune the signal generator
- to convenient frequency, say 4 MHz. Now tune around 4 MHz
- on an SSB receiver.
- --
- ==============================================================================
- Bob Parnass, AJ9S - AT&T Bell Labs - parnass@ihlpm.att.com - (708)979-5414
-