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Re: UHF mobiles
I've had good luck with Icom 6061? Mike Ka2ndw ? ?
By Mike DeWaele · #214452 ·
UHF mobiles
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
By Chad Nelson · #214451 ·
Re: Duplexer for amateur 70-cm band
Yep...I have several myself...I can part with one if need be Chris WB5ITT [email protected]> wrote:
By Chris Boone WB5ITT · #214450 ·
Re: Improving selectivity on a reciver
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
By Mike · #214449 ·
Re: Duplexer for amateur 70-cm band
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.
By Mike · #214448 ·
Re: TX Board for Motorola XPR8300 Repeater?
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:
By Chris Boone WB5ITT · #214447 ·
Re: Duplexer for amateur 70-cm band
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.
By Karl Shoemaker · #214446 ·
TX Board for Motorola XPR8300 Repeater?
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
By Steve R · #214445 ·
Re: Improving selectivity on a reciver
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
By Kevin Custer · #214444 ·
Re: Improving selectivity on a reciver
The OP has inquired how to improve input selectivity - not I-F selectivity.? Go back and re-read the inquiry. Kevin W3KKC
By Kevin Custer · #214443 ·
Re: Improving selectivity on a reciver
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
By Mike · #214442 ·
Re: Improving selectivity on a reciver
Can you post the current IF filter mfr and model #?
By Mike · #214441 ·
Re: Improving selectivity on a reciver
Your helicals should already be much narrower than that. What problem are we trying to solve? Andy Zorca WJ9J [email protected]> wrote:
By wj9jrg · #214440 ·
Improving selectivity on a reciver
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
By steven harvey · #214439 ·
Re: Duplexer for amateur 70-cm band
Basic NOTCH ONLY duplexer. Yes you can get -80+ with careful tuning. Very popular with most two-way shops that are selling simple on-site systems. Milt N3LTQ Quoting "Karl Shoemaker via
By n3ltq · #214438 ·
Re: Duplexer for amateur 70-cm band
for myself personally those have always worked very well. No issues with desense. jonnny kf6phx ________________________________ Sent: Tuesday, April 8, 2025 9:17 AM To: [email protected]
By Jonny Tomlinson KF6PHX · #214437 ·
Re: Duplexer for amateur 70-cm band
I do know these can be had for much less than the nearly $400.00 I see that one going for. Gregg Wardlow Sent: Tuesday, April 8, 2025 12:18 PM To: [email protected] Subject:
By Gregg · #214436 ·
Re: Duplexer for amateur 70-cm band
* Anyone know if this is an okay one for 5 MHz spilt? I need at least 80db of notch (isolation) * Supposedly, it's a Moto. I'm shopping for one. I don’t have one to test, I’m a bit
By Jeff DePolo WN3A · #214435 ·
Re: Duplexer for amateur 70-cm band
Made by EMR and will do 5MHz split. $75 range would be a better price.
By Mike · #214434 ·
Duplexer for amateur 70-cm band
Anyone know if this is an okay one for 5 MHz spilt? ? I need at least 80db of notch (isolation) Supposedly, it's a Moto. I'm shopping for one. -- - Regards, Karl Shoemaker To contact me, please visit
By Karl Shoemaker · #214433 ·