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I suggest placing a resistive VSWR bridge (I have a QRP-O-Meter) between the radio and tuner.? Set to TUNE position, its 6dB loss will limit the VSWR the radio sees to under 2:1during tuning.? When

Ludwig and others, Ok, still no duty cycle at 10V with bad PS#1. DVM shows 5.3V at 9V in and 6V and 10V in. Replaced with good PS#1 and see screen shot below. DVM reads 5.3V where as Diag screen shows

Whenever I repurpose wall warts, I do it by putting an LM713 supply on the output, or I cut open the case and solder the transformer into a homebrew supply. LM7805 or LM7812 are good, and require

Being a new to CW and and these transceivers, reading the forums I am a bit worried of damaging the unit when I get it hopefully by the end of June. First concern is powering the unit.? I know it

Allison, Thank you for your kind words. I appreciate a lot your comment as I value you as a mentor and learned a lot from your posts. -- 73, Barb

Thanks John. Mitch NK3H

Hans, Thank you and Thank you for your support at FDIM before TX challenge. I appreciate a lot. Next year I will be present as a spectator to watch your entry! No way I can beat you if you are

Thanks Ludwig. Will follow up and get back. Mitch NK3H

Thanks GL. Will do and get back. Mitch NK3H

On your 3rd issue, don't set the offset frequency outside the supported range. For example on the low side it is 600 Hz. The firmware lets you select other values and save but it doesn't take effect.

Mitch, here ( /g/QRPLabs/wiki/36874 ) is something about bad SWR values. 73, Ludwig

Although the QMX+ is larger than the QMX, it's still a pretty portable size. It's much smaller and lighter than a typical 100W transceiver. If you manage to cram an internal battery and/or an ATU into

Mitch, T507 winding looks correct, assuming the secondary turns count is right. VA3RR's advice is good. Recheck those soldered connections! JZ wrote:

Mitch - I would try hitting all 6 joints with some heat as a first measure. The sharp edges of the toroid abrading the #28 AWG wire is a secondary concern IMHO, given that mix 43 ferrite has a fairly

I'm going to load test a bunch of random wall warts. It's very tempting to repurpose them, but they appear to only provide the rated voltage at close to the rated current (load). So they really need a

Because of the all profit based models made for inconsistency of tools because of pricing models and out right failure or buyout killing the products.? ?I went KiCad over a decade ago and also

The Hallicrafters S38C that I had as a kid, 1954, used a gimmick capacitor in the IF to affect the BFO. I thought it must have been a left over piece of wire, and learned the hard way. It took a bit

Hi Matt To be clear, I AM on Fusion 360, Eagle is part of Fusion 360. I understand in a couple of years it will be just named differently but the functionality is the same. 73 Hans G0UPL

Barb, way to go! That its a very reproducible design with margins is commendable. -- Allison ------------------ Post online only, direct email will go to a bit bucket.

He has about two years before they have it completely end-of-life; they are forcing everyone to Fusion 360. They won't sell or support Fusion past June 2026 (unclear on whether you can still keep