Bernd Maestling wrote:
> Hello,
> I hope somebody can help my cause I'm getting nuts
> with programming a Tait series I repeater.
>
> I programmed a few dozend times the 27C64 eproms but
> nothing works. The software I use is PGM800 for DOS
> and also v4.x for Windows. My programmer can program
> BIN files ok, cause I already programmed NOKIA/Kyodo
> BSR450 repeaters in the past.
>
> The setup of my TAIT is:
> RX: T855-20
> TX: T856-20
> speaker and channel switch TS0089 (but I use the DIP
> switches in the modules by disconnecting the cables)
>
> I want to programm the modules for somewere between
> 431 and 439 MHz. As I saw, the -20 and -15 modules
> are mostly identical, also are the produced files.
>
> I hope someone can help me.
>
> 73
> Bernd
> DM5BM
>
Bernd,
The T855-20 and T856-20 are designed for 440 to 480 MHz. To use them
below 440 you will need to tell PGM800 you have a T855-10 and T856-10
(400-440). I would suggest saving the file in HEX (not bin) format to
allow you to compare the saved file with what is being loaded into your
PROM burner's RAM.
Once you have programed the PROMs, you will need to adjust the VCO trim
capacitor down enough to get the PLL to lock (monitor the top end of L1
on the VCO boards with a voltmeter and adjust for something around 9
volts). If you have not re-adjusted the VCOs, nothing will work when you
are moving frequencies as much as you are trying to do.
Ed Yoho
WA6RQD
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