Found this community and "Hardware Hackin' the oldies". It came up in a Google search for MSM5564. While searching for a datasheet for the MSM5564 clock chip in the Ft-225RD counter. If anyone has the datasheet would appreciate a copy and any comments on my problem.
I have a FT-225RD that has been off the air for a "few" years after I was in an accident, I am attempting to bring back to life and spec as I could find no repair outfit in the UK who was prepared to sort it for me. :(
The transmitter is on frequency and stable reports say mod is OK, but the built-in counter display is free running on switch on, before settling either on the correct reading or some 2300 Kcs low/high more often low and will stay like that for hours steady.
I now have a DFM and with the Tx on 145.000 (R0), checking around the counter I can see the crystal is oscillating but on 1.310678 Mhz (TP1) (not 1.31072 even when locked, TP2 shows a variable squarish wave 1 to 9 Hz and 5 Hz when locked. At this point I suspect either the MSM5546 or the crystal. Also wonder how critical the 5 volt voltage is, I read 4.8 volts on pin 8 of the MSM5564 ?
Anyone who has seen this fault, has the datasheet please. regards, Dave.:)