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From: miller@dg-rtp.dg.com (Mark T. Miller)
Newsgroups: sci.electronics
Subject: Help with BA1404 FM xmitter chip
Keywords: multiplex distortion
Message-ID: <1991May4.215501.1653@dg-rtp.dg.com>
Date: 4 May 91 21:55:01 GMT
Sender: usenet@dg-rtp.dg.com (Usenet Administration)
Distribution: usa
Organization: Data General Corporation, RTP, NC.
Lines: 23


	I've got the BA1404 FM transmitter chip in a Ramsey FM-10 kit.

	It has a very clean signal if you run it in mono-mode.  However
	if you tune the fm pilot subcarier up to 19KHz, (the proper place)
	there is a very audible "multiplex distortion". (noisy squealling
	sorta' like rubbing a balloon)

	So I have two questions:

	1.) Does anyone know who mmakes the chip so I can get a spec
		sheet to try to figure out whats going on. (Ramsey
		simply calls the chip a "custom chip")

	2.) Any Ramsey FM-10 owners out there who have a circuit mod
		to fix this problem?

	Thanks in advance to any replies,

	Mark M.


	Mark T. Miller					miller@dg-rtp.dg.com
							...uunet!xyzzy!miller