[Kenwood] M54730 Proms for Kenwood

[Ray Brown]

----- Original Message -----
From: James True N5ARW <n5arw@automation-works.com>

> I have collected several Kenwood commercial FM radios that I would like to put on the ham bands.  They are models TK-601S,
TK-701S, ant TK-801S.  I am having a problem finding the PROMs to reprogram them with.  I have a prom burner at work to actually do
the programming if I could just find the chips.  What I need are M54730AP 32 x 8bit PROM chips.  Each radio takes two so I could use
a bunch if I can find them.  I don't normally work with digital circuits and can't find any reference material on these chips.
>
> Does anyone know where I can get the PROMs or if there are any other parts that this might cross to.  I have been searching the
web with google but have not had any success.  Any advise, leads, assistance appreciated.

  The PROMS are still available, but there are better PROMS to use than the factory ones.
With the factory proms, you also needed the factory (Kenwood) programmer. This is better.
I had a couple of 601's here over the last couple of years. An Elmer here helped me decode
what we needed to do. You need 74s188 PROMS and a reader/burner for those. The info
is in 2 2-byte nybbles on M1 and M2. Trying to remember which one is the MSB and which
is the LSB. On location 00, pulling numbers out of a hat here, M1 will read, oh, say, "5B",
and M2 will read "E7", for a 4-byte word of 5BE7. Convert to decimal and add 10.7 for
the IF. I think. It's been a while since I did this. But, I think I still have two wire-wrap
sockets that, when properly inserted, generates a simplex of 52.525 on Channel 1 only.
I just found them. I'll see if I can take a couple of pics of them and show you...

  Oh, then you need to worry about adjusting the VCXO, I think 4 volts will get you
in the ballpark. Then you're set. No, I don't have the manual. Sold it along with the
last 601, can't remember offhand who to, but they are, or were, here...


                _Ray_        KB�STN