ASTRO-TAC

I've been asked to look into the ASTRO-TAC 3000 and 9600 comparators (voters) for a bit now.

These are rather simple in operation devices which use the wireline card and SCM from a Quantar as a voter. The 3k is mostly of interest to radio amateurs now as it supports conventional use, while the 9600 was designed for simulcasted trunked p25 systems.

Controller

The controller is based around the EPIC II SCM, but with the addition of a 68EC040RC33B 68k uP. I've used the 25mhz version of this and it works from what I can tell as it's what I had on hand.

To convert the controller over to the comparator use the following needs to be done

• Install 68040 CPU
• Jumper s701
• Flip the 1st switch on s501 (marked 040)
• Install a blank 28c64 codeplug chip in
• Install a properly programmed SIMM with ATAC 3000 or 9600 code

SIMM/Firmware

Like other products in the Quantar family the SIMM modules are not re-programmable to another product via the RSS upgrade procedure. This is due to the Boot1.o code on the chip which is not updated during an upgrade.

What is unique to the ASTRO-TAC is the SIMM ID jumpers must be set for 8 x 4mbit chips, in two banks. This differs form the quantar which doesn't seem to care.

3.16 is the latest firmware for the 3k from 2005. If there is newer please send it to me and I'll post it.

notes on doing an upgrade

I found it necessary to change the BPID file to the universal one from the quantar upgrade. The installer only makes this directory and uncompresses the files, and it's necessary to mount it's location as a drive and run it as it expects the files to be in the root directory of it's disk. It's easier to just use the already decompressed zip file.

Also, the upgrade only seems to work after letting the SC module write for a long time. I thought the unit was flashing on and off meaning it was failed (typical of a failed quantar upgrade), but I left it and went to bed after watching it for about an hour. In the morning I checked it and found the upgrade had finally worked. My advise to only upgrade it via changing the SIMM; it's much faster.