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[SPAM][CrossCountryWireless] Beverage preamp
Chris Moulding
Hi Steve,
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The active device is an Infineon BFR106 transistor.
You will be OK using 75 ohm coax with it without modification.
What appears to be an output transformer is actually a common mode choke to reduce noise coming down the coax to the amplifier.
Regards,
Chris
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Chris Moulding
Cross Country Wireless
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On 19 Dec 2022, at 17:48, Steve Bunting M0BPQ <steve@...> wrote:
Hi all
I have a CCW beverage preamp and I suspect I have accidentally put too many volts up the coax from a variable power supply. I was trying to see how much voltage drop there is in my 400m+ long coax run. Looking at the circuit, the only thing that can be broken is the active device. What type is this? I can happily replace it myself.I am now using 75R coax. Is it worth rewinding the transformer to match ?
73
Stece