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800MHz to VHF crossband

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70cutlass442

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Okay,

Did some research on the MCS and came up with this.

A guy has made a switching circuit using the external speaker leads. All of the other pins are there. This is where my lack of knowledge in components hurts me. Can this be done using a simple relay? perhaps a transistor?

The other pins would work as follows

pin 4/10 ground
pin 21 PTT (guessing this needs to be pulled to ground)
pin 13/23 MIC IN
pin 11 is discriminator audio
 
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902

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Downsouthsomewhere
I wish I had those resources available to me, unfortunately I don't. I understand the basic theory behind an inverter, but I know just enough to ruin a radio.
I certainly don't want you to do that. Best of luck on the project. I'm eager to hear about how you ultimately make it happen.
 

WA0CBW

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Shawnee Kansas (Kansas City)
Be aware of the pitfalls with cross banding to repeaters. If the control (i.e Tx to Rx) is carrier based then the "other" band cannot transmit until the repeater carrier drops. That means you need to make the repeater tails very, very very short. It is quite common to experience lock-up of the repeaters if the squelch tails are very long.
BB
 

RKG

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May 23, 2005
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Boston, MA
Take a look at the KR NIDA RC-400. Off the shelf, and largely plug and play. You will need someone who can make up the cables to connect to the mobiles you want to connect to.
 

70cutlass442

Member
Joined
Jan 24, 2010
Messages
318
Be aware of the pitfalls with cross banding to repeaters. If the control (i.e Tx to Rx) is carrier based then the "other" band cannot transmit until the repeater carrier drops. That means you need to make the repeater tails very, very very short. It is quite common to experience lock-up of the repeaters if the squelch tails are very long.
BB
There will be EXTENSIVE training before these are put into service. I will admit, I had my doubts on letting people use these as there several drawbacks. I think overall, we need them (we work with communities that have VHF, UHF, and 800) It's just a matter of getting the potential operators trained properly.

Take a look at the KR NIDA RC-400. Off the shelf, and largely plug and play. You will need someone who can make up the cables to connect to the mobiles you want to connect to.
That gateway would be nice... but pricey! I know this can be accomplished at a much more cost effective price.
 
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