Re: [Repeater-Builder] 600 - 10k ohm Interface

14 Dec 2004 03:35:36 -0000

Thanks everyone, I think I have a number of ideas to try.
The unit has a transformer inside, 600/600ohm, the output is floating, so live and ground should be able to be connected across the output. The TX has the same transformer 600/600ohm, but the controller to the TX is a 600ohm line anyway, so it should be fine (by my understanding)
For those interested the units are Tait Repeater modules.
 
The reason for the request, was the matching, and also I have one receiver that has bag DTMF twist, falsing. Unable to use DMTF blanking, as it does it so much with voices. Have setup the radio/controller as required, and tested. Thought a impedance mis-match.
 
Regards
 
Kevin.
----- Original Message -----
Sent: Monday, December 13, 2004 2:30 PM
Subject: Re: [Repeater-Builder] 600 - 10k ohm Interface

Kevin,  I just built one here for our Church for a DVD player, "Stereo" to an 10 K input
on a "Mono" amp.
 
You can use half of what I did......
 
From the 600 ohm OP put a 4.7K resistor to the top of a 5 K trim pot.
The bottom of the trim pot goes to ground.
 
From the centre of the trim pot put a 4.7 K resistor to the 10 K input.
 
Adjust the pot for the desired level going in to the 10 K input and it works very well.
 
 
Since you are using resistors there is no freq. roll off.  A 600 to 10K transformer
would also do but they are expensive these days for anything that is quality....
 
73  John VE3AMZ
----- Original Message -----
Sent: Sunday, December 12, 2004 6:14 PM
Subject: [Repeater-Builder] 600 - 10k ohm Interface

Hi All,
 
I need a simple interface for a 600 ohm output radio to a controller which accepts 10k ohm.
This is a RX not TX.
 
I don't want to make a circuit board if I don't need to.
 
Any ideas?
 
Regards
 
Kevin.
 


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