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Hi, The value of a QMX R520 is 49R9 Ohm and not 5k1. You can use two 100R in parallel or 56R and 470R in parallel. -- 73 Bojan S53DZ

Just completed build of the QMX mid bands. While installing T507, I accidently damaged R520 resistor (5.1K). I replaced it with a 4.7K thro hole resistor. The radio powers up alright with all else

checked, Q508 is good. Thank you for the additional info. James

So i finished my build since it was only weekend work it took 20 days. Carefully assembled section by section, after each section the work was inspected with magnifying glass and dvm for

They are extra material used to support during the PCB manufacturing. If you look carefully you should see that they are partially cut through. Unplug the front panel pcb from the main board and then

I noticed far too late in the process that my front-panel board has two "ears" to either side; picture attached. It is clear from both the fact that the board does not fit into the enclosure thus,

I was just able to get 38 turns. You really have to squeeze the wires together in the inside, even the slightest gap and they won’t all fit. I don’t think that an overlapped turn or two will

Just remember to turn the power down on the KX3. The 50W PA is not meant to handle over 5 watts input. Bad things will happen including blowing up the IFR510 transistors and various diodes. Ask me how

Quick update on this repair: I fitted a replacement 5351 and replaced IC501 and IC502. The radio now receives well so I'm happy that the replacement 5351 is functioning. It's only putting out about

The dip in your passband of the LPF is unfortunate, and you may try to move the windings a bit to see if you can reduce it. But don't try to move the cut-off frequency down, since it is set to cut off

I am just following up here and responding to my message.? The issue I had was self inflicted .? When bringing up the QMX for the first time, I had the voltage set about 6.5V.? Now this should be

Based on your power meter readings, if it were me based on my prior experience, I would suspect that one of the PA transistors has died.? One of mine died with a direct internal short which caused

I'm winding toroids, like we all are I suppose, for QMX+. L506 calls for 38 turns on T37-6. I can only fit 36. The post I've replied to here suggest a gap is desirable. Should I change to 30ga wire or

Hello I am trying to decide a route to improve RF power on 20m band (now with 2,5w). 17 and 12 also very low at about 1,7w. I noticed high SWR near 2.0 in the higher bands 20m up in the diagnostics,

Hey! Thanks for sharing your experience! That gives me hope that I’ll get it working! I’ve ordered the IC, as well as new finals for the amp, from Digikey. I think I’ll run the amp at a lower

Mistakes I made that had similar results while using qmx: I forgot to use putty to change band settings to allow a + 5 volt signal on middle ring (Stereo 3.5mm Mini Jack?).? By default it will not

Howdy Hans, Thank you so much for the tweak; I really appreciate it! I'm curious, what would/could be added that would require the 8-bit mode?

Thank you Hans. I suspected that would be the case but wanted to be sure. Getting that one back out after soldering in would be a challenge in that packed row. Greg Yahoo Mail: Search, Organize,