开云体育

See also this post from a few weeks ago. /g/QRPLabs/message/139008?p=%2C%2C%2C20%2C0%2C0%2C0%3A%3ACreated%2C%2CHandheld%2C20%2C2%2C0%2C111206911

And if you want to do it fully externally,? the QMX does have a PTT signal output that you can use for rx/tx switch.

It's all here including common mode choke - except the whip which is inefficient. Since the radiation with a whip is mostly from the counterpoise, I am using an EFRW of 10m or more (no counterpoise,

You can read more about the QMX receiver design in the QDX assembly manual - Hans did not repeat the design description for QMX. As others have said, there is no real IF.? If you really want to

Matti, please read QMX QMX_plus Startup ( /g/QRPLabs/wiki/36878 ) to find the switch on process. There you will find also some testpoints and values to check. How much supply current

Its been mentioned and can be done...save for that pesky antenna. At 10M a moderately decent antenna is 8ft long.? However at 40M anything that's under about 16ft long is about as efficient as

For some of us, the priority here is operating. For others, it is learning and understanding how this fascinating radio works. Personally, I have never had much interest in operating. I do most of my

Okay, but what about using the signal from the antenna-input directly? I can't use an RF splitter / power divider to the non-amplified signal, I might get away with that buffer board? Not sure about

-- QMX+ has an I/Q mode, that uses the soundcard as interface, allowing for a panadapter. You need bandwidth in the data or baseband that is not there outside of the design bandwidth. Also the sound

Has anyone considered or even actually built an integrated handheld QMX rig? I am thinking something like the KH1. I can envision a 3D printed case that includes the QMX, small battery pack, and a

Dave's right.? That stuff works like magic! A little clean up with isopropyl alcohol and the board is like new. Using flux with the solder wick is also key. I don't think having crossed turns

Hi Matti, Re. no output power, did you remember to solder in a jumper wire on the very center pins of JP501? Regards, Mel. M0KMD

Sorry for the delay.Life got busy . And I actually haven't tried the fins yet. I did some test runs on my fan modified QMX HB and my fan modified QDX HB. I found that I could safely push 50% duty

There is a fundamental lack of understanding of the SDR receiver. First there is essentially no IF, its direct to base band which is the IQ outputs.? All the work is done in the digital realm by

*It serves the purpose of working better than not twisting it.* We can spend all week speculating or debating or citing theories as to why but that's not the priority here

Dale-? The toroid parts listing in the latest manual for the Rev 2 board has not been corrected.? But, it is correct in the board Rev. 3 manual.

Dave- LOL.? Yeah, it is actually kind of relaxing to wind these things. But the counting does stress my poor little brain.... Thanks for the encouragement.

Ed, I tried to check in three times but failed. I'll try again next week. Jerry/k5sop

On Fri, Feb 21, 2025 at 01:07 PM, Alan G4ZFQ wrote: Thank you for your reply! > > IF tap is not possible. That's what I thought, I'm assuming, there's no IF at all? > > With very delicate work

Ed, that’s super good of you. I will try to hop on. K2CWC, FN33, Chris. I wasn’t aware of reverse beacon. Super helpful.