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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?

Last night I replaced the TIP36C bipolar transistor and reflowed the connection to the power plug with no improvement in the modulation or dimming of the display during SSB modulation. I went rummaging through my radio parts stash and I do have a new L7808CV voltage regulator (U750), a new...

All these little things your folks recommended to me in the spring of 2023 like the good small soldering iron and solder sucker make this stuff a lot less difficult to do. Not easy, but less difficult. Now if only it will somehow magically get this radio working again. I hope so because I like...

Done.

The new TIP36 has the same voltage readings as the one I removed. The marks on the one I removed look like they are from the tip of the probe I was using when measuring the voltage and my aim was a bit off at times. My wife chimed in and said it reminds her of the bathroom. Thank you dear.

I did measure it with two DVMs. One reads to 3 decimal places and the other to two. They gave the same rounded readings. I happen to have a new TIP36CW still in the original packaging from Mouser that I will put in tonight to see what happens. I also have a new L7808CV too but the specs say it...

I started poking around the innards of mine at lunchtime today. Here's what I have for voltages so far. All numbers are with radio at full RF power and into a dummy load using the stock mic set to EL level 36. The power supply is a MegaWatt S-400-12 set to 13.8 volts. Nothing else is running off...

I have finally started down the path of attempting to attain the Technician class license. I'm hoping to be able to find (purchase or free, as long as it's good) a comprehensive but clear study guide that I can access on my tablet. One with lots of good scenarios, the correct solution to the...