May 5, 2015 - One is a Tait T535 2-Channel Mobile PMR which can be converted to. Unit I have ordered a second hand copy of the PMR Conversion Handbook as. This is available for download from my website, it is supplied as is. Download a PDF document for Second Hand Surplus 2-Way Radio Conversion Hand Book. Product code: SH 2-way surplus book. Brand: Second Hand Radio equipment. Description; Surplus 2-Way Radio Conversion Hand Book. As 2 - way radio equipment, as used by the police, ambulance etc., is replaced, these sets become available on the surplus market for.
![Download pmr conversion handbook 2 Download pmr conversion handbook 2](/uploads/1/2/5/4/125441107/927879784.jpg)
Yves OESCH - HB9DTX - Transceivers modifications PYE-PHILIPS MX-294/MX-296 or AUTOPHON SE-156 This a pretty old rig, sold by PYE and PHILIPS. AUTOPHON also sold it under the model SE-156. But in fact, the main board was made by PYE.
![Download pmr conversion handbook 2016 Download pmr conversion handbook 2016](/uploads/1/2/5/4/125441107/377782371.gif)
But the front panel is different. So at first glance, the two transceiver seems different. The MX-294 is a VHF type, and the MX-296 is for the UHF band. I modified two of them. The MX-294 beeing now running at a local APRS digi, I have no pics of it available! So I will show you the UHF one.
This was a 16 Chanel Rig, but I augmented the channel number to 64, by adding 2 switches. The modification was made using the very good book of G4HLC, Chris Lorek PMR Conversion Handbook (ISBN 1-872309-40-2), published by the Pages 38 to 55 explain all what you need, in order to modify an MX294 (VHF) or an MX296 (UHF) An other interesting sorurce of information is the web site from, devoted to PMR conversion, especially the MX 290 serie from PYE! A last link, before beginning to work, is the, on So I wont' repeat all the stuff. Here are just some pictures of my work: View of the front panel. You can see the two swiches that I added (gray), in order to get 64 channels. The potentiometer (white) for the squelch, and the 1750 Hz button (red) are also 'new'.
Here is a view inside the transceiver And a detailed look at the 'new' circuit board, where I put the reprogrammable (UV) EPROM and the 1750 Hz generator (based on a NE 555) Finally a picture of the backside of the front panel. The metal can contains the TX and the RX VCOs (Voltage Controlled Oscillators) Last but not least, here is an file that you can use to generate your own EPROM Files. It implements the algorithm explained in G4HCL's book.
You will need to activate the macros. You can also download directly the, but you won't be able to choose the frequencies you want, out of the ones that are provided. I also transformed a second Transceiver of the same model, in order to run a local APRS digipeater. I confess that the case is very 'primitive'. Anyway it ran very well for more than one year now. The easy thing with mono-frequency radios is that they are easyer to tune (no problem at ends of the band, no VCO/PLL lock range problem.), you don't need a channel selector, nor a display to know where you are transmitting!
Yves OESCH - HB9DTX - Transceivers modifications PYE-PHILIPS MX-294/MX-296 or AUTOPHON SE-156 This a pretty old rig, sold by PYE and PHILIPS. AUTOPHON also sold it under the model SE-156. But in fact, the main board was made by PYE. But the front panel is different. So at first glance, the two transceiver seems different. The MX-294 is a VHF type, and the MX-296 is for the UHF band.
I modified two of them. The MX-294 beeing now running at a local APRS digi, I have no pics of it available! So I will show you the UHF one. This was a 16 Chanel Rig, but I augmented the channel number to 64, by adding 2 switches. The modification was made using the very good book of G4HLC, Chris Lorek PMR Conversion Handbook (ISBN 1-872309-40-2), published by the Pages 38 to 55 explain all what you need, in order to modify an MX294 (VHF) or an MX296 (UHF) An other interesting sorurce of information is the web site from, devoted to PMR conversion, especially the MX 290 serie from PYE!
A last link, before beginning to work, is the, on So I wont' repeat all the stuff. Here are just some pictures of my work: View of the front panel. You can see the two swiches that I added (gray), in order to get 64 channels. The potentiometer (white) for the squelch, and the 1750 Hz button (red) are also 'new'. Here is a view inside the transceiver And a detailed look at the 'new' circuit board, where I put the reprogrammable (UV) EPROM and the 1750 Hz generator (based on a NE 555) Finally a picture of the backside of the front panel. The metal can contains the TX and the RX VCOs (Voltage Controlled Oscillators) Last but not least, here is an file that you can use to generate your own EPROM Files.
It implements the algorithm explained in G4HCL's book. You will need to activate the macros. You can also download directly the, but you won't be able to choose the frequencies you want, out of the ones that are provided. I also transformed a second Transceiver of the same model, in order to run a local APRS digipeater. I confess that the case is very 'primitive'. Anyway it ran very well for more than one year now.
The easy thing with mono-frequency radios is that they are easyer to tune (no problem at ends of the band, no VCO/PLL lock range problem.), you don't need a channel selector, nor a display to know where you are transmitting!