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I'm kinda stuck on what to do. One the one hand, it sounds like the radio's problem may be something minor and cheap to fix if you know what you are doing. Or I can easily see myself with a $300 repair bill where a new one is $240. One the other hand, I can post it as a partly-working radio for...

The Radioddity QT60 Pro has now been ordered. Time to button up the Q5N2 and sell it on to someone with the skills to fix it. I had some good AM DX contacts with it today so at least that part is still pumping. Too bad the SSB modulation is not keeping up with the party.

I went through and checked the bias again. Here's what it says. I used three different meters and they were within a few ma of each other on each IQ. TX-IQ1 -> 102 ma (close to 100) TX-IQ2 -> 49 ma (close to 50) TX-IQ3 -> 10 ma unkeyed, 30 ma mic keyed (unkeyed value + 20 should be close to...

Please check your PM. Thanks.

I did do it but admittedly that was before I changed the voltage regulator and TIP36C one. I will repeat it just to make sure it's a known setting. And that I didn't make it worse last weekend when I did it. Nah, that'd never happen.

Yeah, I lost my ambition to swap out the finals as soon as it stopped raining. If anyone on here has a lead on a tech that wants me to send this radio to them and repair it if it's not too costly, please let me know. I'm not asking for a freebie, I believe in paying a person for their time and...

I have been asked what I am using for a power supply. I have tested with a Megawatt S-400-12, a PowerMax PM4-120 and also a 12 volt battery out of my F150. It has also been tested by a tech using his own power cord and power supply. When I test the current draw at the Q5's full RF power into a...

It's raining here today, I've already watched the F1 race in Spa and I am now bored. So, I have decided to replace the IRF520s in the Q5 (Q101, Q102, Q103, Q104) with some new leftovers I have on hand, re-check the bias and see what happens. They are Vishay Siliconix, P/N IRF520PBF-ND and are...

Hitting the end of the road on my ability to further diagnose the root cause of this radio's SSB modulation quality issue means from here on out I would just be blindly throwing parts at it. No thank you. The soldering iron has been holstered. I'm definitely not one to throw parts at my project...

Here are the readings. I tested both with black to source and again black to ground. Same results. Q101 3.595 volts Q102 3.595 volts Q103 4.058 volts Q104 3.854 volts Q109 1.2991 volts

I have several calibers of "tools" available to me here but none from the shotgun family. But I have thought about introducing this radio to one of my little friends. However, I have a feeling that shotgunning the FETs might mean something else to electronics tech/experts. I will say that the...

So much for the "expert" videos on YouTube. I shall take another whack at it.

I am looking at the IRF520 in Q104 as an example of measuring the gate voltage with the mosfet still soldered in place. I switched the multimeter to diode mode. With the radio off, I connected the red lead to Source leg and black to Drain. Then I turned the radio on, keyed the mic on SSB, no...

I've never bought anything directly from Radioddity but if the consensus on here is that it's pretty safe to do so and I won't be SOL if I happen to receive a dud, I'm good with buying from them.

I think the QT-60 Pro is the one for me. I just wish I could get it through Scott's so he could give it a good going-over before I use it. But no sign on his site that he'll be selling it. I think I've been spoiled by the three other radios I've bought from him in the past. Not a "truckerized"...

I asked Radioddity about the QT80 listed on their site as Out of Stock. These are good times to be in this hobby.

It looks like it is replacement radio time for my Q5N2. It has served me well, but is now ill and I don't have the medical skills to revive it. It only lasted 16 months, which is less than impressive. In a replacement radio to use as a base station: I want one with great receive, great noise...

Sorry but time for another dumb question... Can the IRF520 gate voltage be tested with them still soldered in place or do they have to be removed to do this?

I haven't but I certainly will. Thanks for the idea. I checked them and they are quite tight.

Will/does the 6666 Pro have comparable/better noise canceling and receive sensitivity (especially on SSB) as the current Q5N2 long chassis version?