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For what it is worth, the frequency ranges for the GP300 (and P110) radios are as follows: VHF 136-155MHz 146-174MHz UHF 403-433MHz 438-470MHz 465-496Mhz 490-520Mhz Using shift during frequency

RX crystal needs to be replaced. Had the same issue with other GM300. https://batboard.batlabs.com/viewtopic.php?t=103253 Tony

You shouldn't use an attenuator pad with a VNA.? If you do - at least two things happen, depending on where your calibration plane exists: 1 - When measuring return loss (match), the RL value will

Current M dealer price is $1,950, VHF or UHF same price.

On Mon, Apr 28, 2025, 4:41?AM Part 15 Engineer <kc8gpd@...> wrote: > After hours of going at it. I have come to this point. I think it looks > alot better, but still probably can be improved.

After hours of going at it. I have come to this point. I think it looks alot better, but still probably can be improved. 2 things. I can't set the nvna for more than 1024 points and the point rbw

The rx audio comes from the sc-50 along with cos…I just find it odd that this is the exact same failure and nearly the same time frame. The jumper ju551 in the gm300 is set for discriminator audio

Anything else on the Disc line other than the SC50? Does the audio into the controller come from the SC50 or DISC audio out? You have to consider both input impedances in parallel if it is ... but

I will start out by saying this is the second gm300 to do this to me. I use it as a repeater receiver. Does very well for what it is. The unfiltered rx audio from the gm300 feeds a masters SC50 micor

Thanks, Mike, I found that you can never have to many fans. Chad Nelson WI9HF/WRPL979 Janesville Wisconsin 608-754-8671 Send from my spectrum iPhone 16.

Here’s the last one I ordered. And these guys ship quick too! https://www.coolerguys.com/products/panaflo-nmb-80x25mm-high-speed-fan-hydro-bearing-3-pin-fba08a12h-1bx?_pos=1&_sid=90caa47d4&_ss=r

We have been having an extra tough time getting the brushless fan noise on a Henry amp out of a linked repeater audio line. Tried more and more, now up to 4 automotive noise filters in series, and

Why don't you just bypass the switch, like a non switchable type. Those switches do go bad in time, and let the outlet circuit breaker trip if there is a short. Charles Adams Industrial

Hi, me again! Lol. Does anyone have a power strip that is 19 inch rackmount with about 8 to 10 outlets which is AC with surge protector? I have one but it came with the rack that I bought in the

I'm trying to run this thing in my battery backup system as well so running it on an actual power supply wouldn't work all that well unless the power supply is powered by the battery. And on another

I found on mine running it on irlp or allstar, had to run a fan on both heat sinks and cut power back to about ten watts. Cost me a p a replacement to learn that lesson. Butch

The other thing I've tried, and that is if the noise is on the dc line is running the fan on a separate small 110 v 12 vold dc supply. However, Get the ones that still use an actual transformer. I

I have the same repeater. Great little machine! I use an external power supply to reduce heat inside the cabinet, and can take with me for field expedient repeater Benjamin,

Iirc some were...it could be the 723 regulator going bad or a cap dying...if that's the case, replace the regulating IC usually a 723 and check the pass xstr to see if it's dying...you should see 18

I find that grounding plays a role in DC fan noise suppression; try running the filtered fan power wires straight to the power supply. Bob NO6B