Please see click here for details of GB3DR and the logic.

It can encode the 10 UK CTCSS tones and generates a signwave.  The tone is selected by the combination of jumpers in 4 positions.

It's powered by 7 to 16V DC and draws only a few mA.

There is an encode enable input that connects to the radio's PTT line (active low), and the tone select inputs are constantly read so you could change tone with a switch.  You can tie the encode enable input to ground for continuous encode.

Click here for full details.

Our DTMF decoder kit has 6 NPN open collector darlington outputs that can be switched on/off remotely with or without a 4 digit security code. The decoder also has a TX keying output to key a transmitter for transponding a Morse confirmation. An audio output is included for the morse audio tones.

Click here for the main DTMF page.

2 metre amateur band cavity filter by Procom type BPBR 2/2-200.

This 2 cavity filter will pass an amateur repeaters RX frequency and notch the TX frequency 600KHz above.

Click here for manufacturers data sheet.

You could use this filter with the above base station and our logic for a complete 2 aerial working repeater. Or you could use it with another repeater.

This item belongs to an amateur in Scotland and he is looking for reasonable offers, cost new was £850

Please contact us for the sellers details.

We have about 15 VHF and 6 UHF GP300's available, all have new batteries £80 each

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For info on GB3DR Dorset Amateur Repeater click here

We are currently developing a CTCSS encode/decoder module as all the used modules we had have been sold.

For our trading terms click here