Re: [Repeater-Builder] What is this board?

[XE2SI]

The proms you are talking about are for frequencies and tone memory programing, the MN6520 is in the CTCSS board Juan   ---- Mensaje original ----- ----- Original Message ----- From: "Adi Linden" <[EMAIL PROTECTED]> > > It is CTCSS encode/decode...didn't you see my other post....that's what > > the MN6520 chip is! > > Great! Thank you. Sorry, I didn't read your post until after I replied. > Any idea where I can find information on this chip? I've goggled for this > extensively before posting the question here. No useful results searching > the web.   If it is the same chip used in the Kenwood 601/701/801 radios, it is a PROM chip that has a built-in decoding system, used with a programmer, to burn the PROM with info. A drop-in replacement for the chip is a 74ls188 PROM. Simply drop yours into a programmer, read it, analyze what you need to tweak, then burn it into a 188 PROM chip. I had a 601, a ham Elmer and I decoded what was on the chip, what it did, and decided that a PROM would be much easier to handle than getting the Kenwood programming tool. (In the 601, two chips controlled the xmit and rec frequencies, and a 3rd on a separate board did the CTCSS.)   I thought I still had the old PROMs here, but I still have the first test-set of where these hard-wired pins will put a -601 on F1 at 52.525. Probably won't help you out, but it's in the right direction. :-)                 _Ray_        KB�STN Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.