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Author Topic: External CTCSS encoder in a 10m rig  (Read 750 times)
K5LDL
Member

Posts: 56




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« on: September 20, 2007, 03:40:58 PM »

Hello folks,

I have recently come across a Magnum 257 10M rig.  The reason I got it was because it was VERY affordable, does 10M All Modes, and if it and the Alinco were to be stolen from my truck, it'd still cost less than the Icom 706.  On with my question...

Has anyone ever tried or knows how to hook up an external CTCSS tone encoder into, onto, this radio?  The encoder I am currently looking at is the Communication Specialists TE-32 which is an external switchable tone encoder.  The radio does do tone encode, but it only does 1 tone, 88.5.

I've done a little research and there seems to less than 20 repeaters worldwide on 10M that operate with this particular tone.   So I figured an external tone encoder would be just the ticket.  If anyone has any ideas, I'd love to hear from you!

The best of 73!

Luis KD5KJD
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KE3WD
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Posts: 5694




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« Reply #1 on: September 20, 2007, 04:11:34 PM »

The Magnum 257 is actually the radio that the Radio Shack HTX-10 was based upon.  Very much the same.  

You will need a service manual or schematic in order to hook up the Comm tone unit, looking for the deviation potentiometer inside the rig, typically these will hook that one wire to the center wiper of the deviation pot.  Not always, some rigs, you have to find the deviation circuit and might have to put your own potentiometer in there to adjust the output level of the tone board before injection.  

The other two wires in the Comm cable are just power, 12V and ground.  


KE3WD
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W5RB
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Posts: 565




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« Reply #2 on: September 20, 2007, 04:31:33 PM »

The Comm-Spec units have a pot onboard to adjust tone deviation .As I recall , the book says  to set for 500  Hz deviation , in the real world , about 750 Hz gives you a little extra margin in weak-signal conditions , without becoming audible on the far end .The deviation control inside the radio is a good , easily identifiable and accessible hookup point .

Russ, W5RB

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KA5IPF
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Posts: 993


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« Reply #3 on: September 20, 2007, 06:42:51 PM »

Search Com-Spec's website. They, in the past, have provided hookup info for their boards to about every radio in the world it seems like. If it's not there call them, very good people to do business with..

Clif
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WA9SVD
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Posts: 2201




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« Reply #4 on: September 22, 2007, 11:41:25 PM »

Comm-Spec has the instruction manual and schematics on their Web site.  their units typically have an adjustable resistor ("trim-pot")to adjust the audio output level.  But if the Magnum is not designed for a CTCSS encoder, you WILL need the schematic for the radio and/or instructions from Comm-Spec to make the proper connection and properly set the deviation level.
    Whatever you do, RESIST the temptation to try to inject  the CTCSS tone through the microphone audio circuit.  It won't work because of the intentionally limited frequency range of the mic audio circuits, and it WILL cause distortion and splatter on your signal.  
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