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Nice video. Well done. Just one correction: you CAN program it through the RS232 Port & using "U-Center" (for u-blox). There are literally 1000's of configurations for the GPS receiver. Including what Satellite Networks the GPSDO are enabled. GPS, Galileo, Glosnos, etc.... Here's a good video of how U-Center works by Tony Albus for this particular GPSDO: ua-cam.com/video/eAdJSErqZOk/v-deo.html Skip to "17:42" min to get to u-center. He also has a download URL in his description.

There might be an EB note in Motorola's RF Application Reports book.

Mine exhibits a lot of harmonic output in the absence of an output LPF, which is needed before putting this unit on the air. The manufacturer also states that it must be protected from any accidental output open circuit or short circuit load and will only work into a maximum SWR of 2.0:1. I have an output load out-of-range detector and shutdown circuit, which I designed and built myself. This circuit of mine will both ground this amplifier's bias line (to zero volts) and inhibit exciter transmit power being applied by disabling PTT when the output load is out-of-range; open, short, or SWR greater than 2.0:1. One diifficulty I had with this amplifier's PCB is there is insufficient clearance between the PC trace for the center tap of the secondary side of the input ferrite RF transformer and an adjacent swath of ground. This can result in an evasive intermitten short to ground on the center tap of the secondary side of the input ferrite RF transformer, which kills the bias to the power FET gates.

Helo wats for name of software?

Excellent video.. Thanks!

What is the EPROM part number. 73, KN4VA

I know this video was made a while back, but do you have an actual drawing or some written reference for this. I would love to make one of theses. I am looking to do one for the CM108 card mods, and this is very similar, but different. Love doing this kind of stuff. 73, KN4VA

How long would it hold on ft8?

Building one for usdx 5w HF transceiver. How do you get around the PTT circuit? Jumper? Do you recommend adding low pass filter. Work mostly 20m DX. Thanks. Kk3sc

WHAT IS POWER SUPPLY VOLTAGE FOR PROGRAMING DEVICE?

I have a 16 channel MaxTrac on 45 Mhz . Can you modify mine to 32 channels and program to 6-meters?? What is your contact information and address so I can send it to you? Thanks, Joe (WD8BVL)

Great stuff, I’m still rockin the OG 9.6 board you created!

That looks pretty sweet mate! Great work indeed

Hey Joe, Hope you've been well. de W2JON

Have you thought about selling the main pcb?

Very interesting! Have you ever thought about an OCXO on the same pcb? That would be a good GPSDO.

This linear is not linear if built directly as per the parts. What is missing is R6, it should be 18 ohms 5 watts.

What transistors/MOSFETS?

Does it work on 11 meters ssb?

I bought one of these kits and am having some problems with it. One of the large ferrite cores came with a center hole to small for the bussing to fit in it. Not sure why? And when assembling it I broke a terminal off one of the electrolytic Capacitors. That one was on me. Replacement parts are on the way and we will see how it preforms.

by now there is a kit on ebay assembled or DIY with up to 200 watts (24 volts /16 amps, 5 watts input). I bought the assembled one and I must admit it is very good soldered an wired

Surface mount scares me away because I have bad eyesight.

Hi, what is the exact solution for Serial bus error #2- no acknowledgment?

Great video, whats the typical current at 70 watts???

To low

Thanks for the video. I'm hoping to get this to would with my GTX using the correct software. Tried to check out the link and it goes to a page that requires you to install an extension to your browser. Is that right?

How do you adjust the cycles?

Tks for sharing, very cool and interesting. Tks again Joe

Back my chanel

How do you check the bias voltage. Which is the C7 capacitor. Cannot locate it.

hola de argentina alguna posibilidad de enviar el dos box y el sotfware de programacion del gm 300 desde ya gracias

I built a Heathkit GW12 CB Base in the 1960's when I was a teenager. I found a working GW12 at the Dayton Hamvention. I replaced all tubes and tuned it according to the manual. I can only get .5 to .75 watts out of it. Will that be enough power to run this little amp? I would think with .5 watt in it should put out 3-5 watts. You mentioned the resistors getting hot, would it help to mount resistors of a higher wattage? I am expecting the kit to arrive July 17 2022.

I hae built this and its still to test. These videos and webpages about someone making it before were very helpful. I had resorted to looking at the pictures of coils how many rounds they needed to wind. Manuals are also quite rare for this, I don't know whether there exists any in Chinese. Still need to acquire load resistor to test this before getting it online. Did cost really nothing, 25 euros including postage.

Thanks for doing a video on this. I've been looking at these on Ebay and I appreciate your thorough, honest review on this thing. 73's-Ryan

Strange, I set mine to 191 but still get the #7 error

I heard no mention of what voltage you were running the amp at or the current setting you used on the bias.

gm300 program software

Thanks for sharing.... To be honest, somehow I doubt that IRF530s are any good on 28 MHz. Or are they?

Great video! I'm looking for an alternative to the MASTR III's and the Motorola MTR3000 just can't simulcast. I have a couple of 840's i'm now inclined to play with. I still haven't solved the issue with the 9.6 mhz clock in the RTCM making things drift though.

Good evening, I have an XDT-PA100 amplifier. I have a cable for yaesu ft 818. I have a red and black wire on the amplifier. with what color do I connect to the cable cat

Good evening, I have an XDT-PA100 amplifier. I have a cable for yaesu ft 818. I have a red and black wire on the amplifier. with what color do I connect to the cable cat

You don't use the bias to set the power in a push-pull linear amp. The bias is set to reduce crossover distortion. If you set the bias too low, crossover distortion will create intermodulation products. If you want to reduce power, the only way to do it is by reducing drive from the exciter. either use an attenuator or reduce your mic gain.

Excellent ! following your tutorial I got it to work first time using a 3Ghz dual core PC running windows 10 Professional. Many thanks for sharing this info and creating the video.

Serial1=directserial realport :com 1 Will assign a port as long as the device is using com1 and the device is turned on and connected to computer.now I am using com 1 as an example.if your device manager said com 2 then serial would be com 2

With dosbox you have to assign a port otherwise it won't work.your application has assigned port yes but dosbox needs to see the port otherwise it will not work

I have the Motorola radius sm50 and I need to change the pl tone.its a gmrs repeater.your a life saver man I looked all over for why the #7 opcode error wrax810 Kn4gtu

You really really helped me big time I was getting the error I had no idea that the 191 had to be true.i have the radius sm50

I am running windows 10 with dosbox I am trying to program the sm50 radius.i keep on getting a invalid opcode error number 7

sir, what did you do in order for the radio will be read by the software I already adjust the cycle to 191 , whats the power cycle radio means? need your help sir