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Such a device exists.? Its commonly referred to as a Thumper. Basically it is a high voltage pulse that causes the fault to break down.? I rented one on 2 occasions to locate a underground fault in

John – can you elaborate? Sent: Tuesday, April 8, 2025 9:37 PM To: [email protected] Subject: Re: [repeater-builder] UHF mobiles TK-890's aren't bad, but some need slight

I did the same with great success. Also added a ~2" muffin fan to the additional tx deck heatsink. Been working well through thousands of daily nets for close to 10 years. Ross kc7rjk

TK-890's aren't bad, but some need slight tweaking [email protected]> wrote: -- John Kreno The line separating good and evil passes not through states, nor between classes, nor between political

For anyone not reading our original post a little background. The repeater-builder article on the TK690H mentioned that the black KMC35 mic gave better sounding audio than the OEM grey KMC27 mic

I have a Harris XG-75M that does 440-512 stock. Got it off eBay for about $175. Excellent radio with lots of features.

I've had good luck with Icom 6061? Mike Ka2ndw ? ?

Hi, Does anyone know what version 2 UHF radios in the commercial line will operate 440-470 straight through without retuning? I have the TK 8180 which works great in that range, the TK 8302

Yep...I have several myself...I can part with one if need be Chris WB5ITT [email protected]> wrote:

The schematic for the receiver in question shows a single broad band pass filter before the FET 1st amplifier then a three section helical resonator after that. Not a very good design which would rely

If you can make it to Dayton in May there will be lots of those duplexers there cheap. Last few I bought were under $50 and they work fine.

Swap the TX and RX decks...replace the piss poor fabric under the heatsink on the TX..use artic silver....run power lower at 30 instead of 40watts .. Chris WB5ITT [email protected]> wrote:

Yup, Jeff, that was my suspecition as well; reason I reached out.? Thanks guys for the input. I'll keep looking. It's for our new fusion repeater at a site that has little population in these bands.

I am resurrecting an XPR8300. The TX board is scorched. Board #: MOTOTRBO U1-HP 8486777Z14-C UHF Ham Range Does anyone have a parted-out XPR8300 willing to sell the TX board to me? The poor

Steven, Receivers provide "selectivity" at various stages - and each have different purposes. The front-end is selective, and operates at the fundamental operating frequency.? The front-end

The OP has inquired how to improve input selectivity - not I-F selectivity.? Go back and re-read the inquiry. Kevin W3KKC

Never mind, I looked it up and its a custom 10.7MHz crystal filter using four discreet crystals. If you have the equipment you could sweep it for response then shop for a packaged filter with better

Can you post the current IF filter mfr and model #?

Your helicals should already be much narrower than that. What problem are we trying to solve? Andy Zorca WJ9J [email protected]> wrote:

Hello Everyone, Let me first say this is an experimental improvement to see it will work.? ? I have a hamtronics reciver board that is running in the 220MHZ space.? ? ?It's one the last board