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 UK (GB3LD, GB3CD, GB3RC, GB3AA, GB3LF, GB3GD, GB3SS, GB3RC, GB3ND & GB3LG to name just a few), the HOZ design has proved both reliable and cost effective.

 

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