TFT
Amateur Radio Repeater Logic
Telephone: - 01546 510355 Mobile: - 07748 988576 logic@tftransport.co.uk
TFT can supply amateur radio repeater logic drawings, blank printed
circuit boards, and complete kits or complete built and tested PCB assemblies
for the HOZ logic design. We can also supply any individual part used on the
HOZ logic design and we also offer a programming service. Using the GD4HOZ
logic design with a receive decode CTCSS circuit added by Bob Wilkinson G3VVT,
the design has been further refined and put on a PCB by Pete Gaskin MM1FEO.
TFT, and with the agreement of GD4HOZ, provides this
technical information in the interests of promoting the Amateur Radio hobby,
and not for commercial gain. All parts are provided at cost price plus a 15%
handling charge only. Due to our bulk purchase on many items, we can often
provide parts at cheaper prices than can be obtained directly from suppliers.
Now used on many 2m and 70Cm repeater sites throughout the
We are now supplying the PIC16F74 instead of the PIC16C74
that the HOZ logic was originally designed with. This Flash chip is not only
cheaper than the one time programmable chip but can be re-programmed.
Prices
Blank PCB £25.91
Complete Kit including unprogrammed PIC Chip £120.79
Assembled & Tested PCB £170.00
PIC Source code change & Programming for specific
repeaters £20.00
PIC Programming £5.00
Completely assembled tested and programmed for your specific
repeater £190.00
All prices include UK postage, but are
plus VAT
The operators manual, circuit diagram and parts list are
available here for free download, the source code is available free upon
request.
Hoz Manual Circuit Diagram & Pye F494
connections Parts List 
PCB Legend
Application Notes
Using HOZ logic with Nokia BSR150 
False Decoding of RX CTCSS
If you are running older HOZ code, here
are details on a couple of simple updates & some code assembly notes.
Morse Code Error 
Code Mod – Phantom Access Code Assembly Notes
Repeater Service Manuals
Nokia BSR150
We can re-program EPROM’s for the BSR150 if required.
Useful Links to the Microchip site and
to the Yahoo Hoz logic user group
