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I discovered that the supply voltage readout on my TX-500 is not quite as accurate as I would like. I use a Bioenno BLF-1203AB battery and monitor the TX-500 supply voltage indication when it drops to around 12.7 Vdc to determine when to recharge the battery. However, I've noticed that the TX-500 supply voltage reads about 0.3 Vdc lower than the true value. So I decided to measure the accuracy and linearity of the voltage readout. I powered the TX-500 in receive mode with a bench DC supply and measured the DC voltage with a calibrated Fluke 87V DMM at each display readout of the TX-500, from 13.8 to 9.00 Vdc in 0.1 volt increments. Of note, the display showed "LOW POWER SOURCE" in reverse video when the DC supply was set to 9.0 Vdc. (BTW, the receive current draw over this range was 100 mA to 135 mA .) The attached Excel workbook contains the measurements and a chart (see below) that plots the Fluke measurements vs TX-500 supply voltage displayed. Also shown is a regression fit of the data, which is as follows: Vtrue = 0.9964 * Vreadout+0.2709 (Vdc) with an R-squared value of 0.9998 So for my TX-500, the readout consistently reads 0.27 Vdc low. I think a nice feature that might be considered in a future firmware upgrade would be to add a user-set battery voltage offset correction for a more accurate readout. I'd be interested in hearing from other TX-500 owners on how your unit reads true. 73, Steve NQ1F

I have not been using my LAB599 TX-500 so wish to part with it. This package includes everything in the attached photo including the: TX-500 with original packaging box, Weatherproof Custom Case, Lab599 Mic, CW cable, Power cable with Powerpoles, PTT cable, Lab599 Direct mount CW key paddle !!!, DigiRig for the TX-500 with DigiRig cables, USB cable between DigiRig and your PC, A pair of protective covers, 2 programming cables (original and newer USB version), Homemade adapter cable with audio in-out and PTT for an amplifier. I include many additional GX type connectors, mating sockets and GX connector covers, too. Asking $930 for the package which includes USPS or UPS insured shipping to CONUS, no international. Prefer PayPal F&F (or you add their 3% fee of $27 to the cost), or CHECK and will ship once it clears. You may refer to QRZ for my info. -- Glen - WB4KTF, Austin, TX USA

Hello, I have a couple of issues that I noticed on on my recent SOTA outing, and I am hoping to get some help with. >>Issue 1<< I am trying to replace the stock speaker-mic with something lighter. Should I expect the 6-pin adapter to work with regular earphones? Based on a short glipse from the following video it seems like it should work: https://youtu.be/LitUhrdochQ?si=Osdk7iLesIIQ5Pyy&t=116 Unfortunately, when I try it with my earphones I hear a loud noise: https://youtu.be/JFLTgs26gdw My setup in that video is: - Pretty standard earphones with an inline mic, their connector is TRRS - Pretty standard headphone/mic splitter: TRRS to 2xTRS - GX12 6-pin adapter that came with the radio Same results with another headset I tried. >>Issue 2<< Last week I was activating a SOTA summit. I was using the speaker-mic that comes with the radio. I also had headphones plugged in. I was using the MON function as well as the VOM1 to compare recorded audio. This was with the gain and compresion settings that have been verified at home. - On 10m my recorded voice was a bit scratchy, but readable. - On 15m my monitored voice was just garbled noise. I unplugged the headphones, tried again. - On 15m my voice was quite distorted, but not as bad as with the headphones plugged in. I was using an EFHW cut for 40m - a proven, trouble-free performer with IC-705 and KX2. Had a 3m feedline to the radio. Attaching picture of how I was setup on the summit. Thanks for any insights! Szymon WV0X

I’m looking into an amp for my TX-500. Has any of you used the XPA125? Is there an ACC cable available? thank you for your insight and opinions.