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So, is this "resolved" or ??

TIA for an answer.

es vy 73 de "baab" w9ya

Kjell,
When I'm in a mood for QRPp, I haul out my Zachtek "Flea" transmitter and the ATS-25 general coverage receiver I use with it. It's only 300mw, on 20, 30, and 40m. It doesn't have to be that particular receiver, I just chose that one because Harry from Zachtek used it for his own Flea and knows it works properly. The Flea handles antenna swapping between the receiver and transmitter, and it has a very imaginative frequency spotting feature that makes it dirt simple to find the transmitter frequency. It's a VERY small transmitter, about the size of an index card. The receiver is actually larger than the transmitter in my case. I power the transmitter using a USB-C Power Delivery battery bank and a 12v trigger cable with the correct DC coaxial barrel plug on it. I have a link dipole for 20/30/40m that's resonant in the CW portion of each band, so I don't even need to tune the antenna, just make sure the correct links are connected.

I used this setup at Field Day a couple of years ago, and was making contacts 800+ miles away from our ham radio club's usual Philadelphia-area camp in a local State Park that has camping. I was being heard quite effectively near the Illinois-Wisconsin border and thereabouts.

For those concerned, the PD setup I use is not plagued with birdies or other noise. I routinely operate out and about using such power supplies. I do have a couple of LiFePO4 12v batteries that I can bring to bear, but they're heavy and bulky, and need special chargers. (Not as heavy as the Sealed Lead-Acid Batteries I was using prior to LiFePO4 availability, but still heavier than a 10-20Ah USB-C PD power bank. I've even operated using the 4,000mAh PD bank I keep in a pouch in my pocket. Works great. I had an article in QRP Quarterly some years ago that showed my first PD trigger board (I found it on Tindie) connecting a compatible PD power bank to one of my original QCX radios. As long as I used the correct size of barrel plug, it always worked like a champ.

But I do seriously recommend the Flea as a very useful QRPp transmitter. It's also relatively inexpensive.?



The software for the Flea was created by Kevin Loughin, KB9RLW. He has a whole series of YouTube videos on the Flea project, from various stages in development. He also operated at Field Day, using a Malahit receiver. Kevin hasn't been doing a lot since he caught Covid and was laid low with Long Covid and is still having difficulty getting back into the swing of things. Here's his video relating his Field Day operations.



Worth a look, even if you never get your own Flea.

73,
Gwen, NG3P

Rather than try to add SWR protection circuitry, try protecting the BS170's:

I also added the zener across L14 for good measure. My Final blew for no known reason once. I replaced the BS170,s added zeners per Sverre plus the one across L14 and have had no issues since (6 + months and hundreds os QSOs). I did this to both the high and low band QDX radios.
I moved one of the antennas from the switch to the Icom so my Grandson could listen to the QDX transmit, then forgot to move the coax back. I was transmitting into an open switch port at full power ( I always operate the 12v radios at 11 volts) with no ill effects.
YMMV

On 26/02/2024 18:52, David Alexander wrote:

where do i find instructions for the above unit?

Dave



Lots linked from that page.

73 Alan G4ZFQ

I am a nubie to the group so be easy.

where do i find instructions for the above unit?

dave k7da

I once set up a BIOS EPROM to flash SOS on the carry light.? Well actually any message in Morse.

Chris, G5CTH

Hans, I know upgrade is easy, I've done that before ;) Believe it or not, my (yes, MY) problem is, that PC I use on daily basis is unable to write USB drives. Can read but cannot write. Unbelievable? :)? So firmware update means I gotta go grab some other PC. And that's the reason I'd prefer to know in advance.
No worries, just do your job and if I'm one version behind, that's no big deal.

It was a standard routine done back in the Vaudeville days performed by many acts. The 3 Stooges and Abbott and Costello both have famously recorded versions. A true classic!

Should I be worried if order 82084 shipped but 81846 is still just showing as "Complete"? I just want to make sure that mine hasn't slipped through the cracks or something, since I never got any confirmation or shipping email.

Thanks!

I'm not clear on what Simon is saying.? In my case, I have the clicks all the time, but they are much worse if there are are other signals in the receive passband.

73,
Randy, KS4L

When using Win 10 and 11 I see? receive gain is easily adjustable, usually 50db range with my FT991A? utilized
on Digital modes?
However with QMX and W10 &W11 computers on WSJT-x best I get is 30db and? about 35 db on JTDX max.

Question Is there an adjustment I missed in the manual or in Putty?

Thanks for posting this!? It's been AGES since I've seen it.? Is 'Niagara Falls' strictly a Three Stooges skit or have other comics done it, too?

Added to the output of the Hyelec PS-28A is a 12 VDC, 3ADC, 50w zener, the NTE 5254AK, mounted on a 3 inch x 5 inch extruded aluminum heatsink.
Well, so far, so good. I shouldn't be breaking any more of my favorite rigs PLUS, the crowbar helps to keep the shack warm!
72,
Bill, N4QA/4 in Oak Island ( OKI ), North Carolina, USA

On 26/02/2024 14:08, Stephen Farthing G0XAR JO92ON97 wrote:

I’m starting to learn Micropython and thought this might be a suitable starter project.

Steve,

Oh, OK then my thought of a U3S defeats your purpose:-)
Best of luck!

73 Alan

OK so you have a different problem then I do.
My QMX just stops transmiting WSPR after 10 hours or so even though the display still shows the transmission when the time comes.
I have noticed this all along (with other firmware revisions).

If I turn the QMX off and on it will work fine again most likely for 10 hours in the WSPR mode.

Michael N2ZDB

Alan,?

The power reduces as the input voltage does -?
IIRC the ‘raw’ supply runs the last few op amps on RX, the backlight and the PA.

The limit is around 7V into the 5V regulator which is more like 7.5 at the input jack, ?the backlight and OP amps are still just about OK at that level ?