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AFAIK, they are triac operated and run on AC. Designed for 250v AC and 2A

If used for DC then probably it will latch up and? not release (open)!

At 07-10-2017, you wrote:

Brent, have you tried your mixing scheme on U1 perma-powered? or would that be too butcherous?

Dex ZL2DEX

Thanks for the replies.?? I was going to wait until a connector arrived next week to test the mic but I think I will just lash the wires together over the weekend to see how it works.? I will post the results.
Jim

Hi Brent,

I love the little QCXs!

Like the Bitx40 the QCX offers incredible value for money (as I think the Bitx derived MKARS80 also did when I built that - my first kit - a good number of years ago now). I have a QCX for 40m and another one for 20m (the later which I bought directly from Hans at the UK National Hamfest last week) - both are now built and operational but neither are cased. I have bought kits from Hans for many years, in fact since his original QRSS transmitter kit, through the various iterations and options of the Ultimate beacons and, of course, the QCX. It was great to finally meet Hans last week and to have a brief chat about the QCX design and some thoughts for the future, he did comment that he has been overwhelmed with orders and has had a couple of supply issues, but I understand everything is now back on track.

Build time for the QCX was about 6 hours for each unit in 30-60 minute sessions with no problems with either build - alignment is all done from Hans' clever inbuilt functionality and takes about 20min. The manual is a masterpiece in clarity. Both my QCX are also destined for SOTA use next summer so it will be this which will drive my eventual case options. I have photos of my 40m QCX here:??

I would highly recommend a GPS (the QRP Labs one works very well) if you are considering WSPR (for time synch) and even if not thinking of WSPR the GPS is useful for automatic calibration of the oscillator and maintenance of frequency stability.

I have worked UK to USA and Canada 2-way CW QSOs on both the 40m and 20m QCX (5000Km plus). Both have been spotted in VK using WSPR on both.

Output on the 40m version is 3.8W at 12.5V, the 20m version is 1.8W output at 12.5V. The antenna for both bands is an OCFD at 20ft above the garden.

Anyone awaiting? a QCX who can solder and takes their time to enjoy the building of it is going to love the little CW transceiver, and even if you are not a CW Op yet it's a great incentive to learn!

73 Carl M0ICR, London, UK

Hi Carl

Off topic, but how do you find the little QCX? I ordered one for 20 metres. Now I just have to wait for the other 500 in front of me to ship. Both the QCX and the bitx are destined to be camping rigs.

73
Brent
VE3CUS

Here is another idea I had, based loosely on the VU2ESE scheme:

I'm not completely satisfied with the simple method of injecting side tone at the output of the lm386. It works fine for headphones, but is too low for my liking using a speaker. Decreasing the value of the 1k resistor increases the side tone level, but reduces the output from the receiver. I have been experimenting with a lm386 module I picked up from kits and parts several years ago and find that I can effectively mix the output of the radio and the side tone? at thehe input to give a nice balance whether using speaker or phones. Rather than perform too much surgery on the main board, I thought of using the additional module to power speaker and phones, re-routing the audio from the volume control to the new amplifier. I would then re-purpose the on board audio amp as an agc amplifier, fed directly from the preamp, using a separate pot to set it's level. I would then rectify and filter the output, and apply that voltage to the gate of a 2n7000 which shunts the receiver input? to the new amplifier. I know the lm386 is massive overkill for agc, but if it works, why not? Comments? Thoughts?

Thanks
Brent

I wish....however I did manage about 3000km into northern Brazil the other night.

I hear myself in the headphones even when the volume pot is all the way down, effectively grounding the input to the lm386, so here is what I think must be happenning:

When I go to tx, the audio path to the lm386 is broken by k2, at points m1 and m2. Additionally, the Vcc to the lm386 and audio preamp is shut off by k1.
However, c110 and c114 continue to power the 386 and the preamp for a second or two. Audio from the mike amplifier enters the receive audio preamp through c116. Even though the audio path is disconnected, the active preamp modulates the voltage provided by c110 and c114 until they die, effectively providing a small audio signal at the lm386 output. Let me know if you think this makes sense.

Thanks

Carl M0ICR wrote:

>Thank you Allard, my word ... you have been busy :)

and I concur! Between Allard and Jack W8TEE, Farhan's BitX concept has been well-established as the Hacker/Maker's delight. I haven't even got mine working yet, but even/just the fun of keeping up with developments is addictive!

73 de ZL2DEX

Thank you Allard, my word ... you have been busy :)

73 Carl M0ICR

Thanks Arv and others ...

I had a dim recollection of unrar at command line, but lazy me did the reboot.
This despite the lottery of "how many updates is it going to insist on before usability?" (I don't go there much) - plus the interminable wait in the startup splash-screen - and the second lottery of "how many updates arrived while I was here, that it will insist on - "please do not shut down until completion" (at peril of complete destruction of the total machine!), and the interminable wait in the shutdown/reboot phase.
Fortunately neither lottery was enacted, and I was able to get in and out relatively unscathed (this time).

The unit looks relatively simple, but that's deceptive and one would need to build one's own 'from the ground up' to understand each component's purpose and interaction/s to follow its operation. An addition to the text file giving 'theory of operation' would be very handy.

73, all, but I'll be trying VU2ESE's scheme and my version of it (when my Raduino arrives).

Dex ZL2DEX

I'd appreciate a functional description of the blocks as I'd like to introduce custom upgrades if I may.
I have the instrumentation to help with the project, Rigol DSA & TG, 8753D VNA, Tektronix Calibration gear for amplitude, 3 channel variable linear PSU, Agilent NF analyzer and noise source, Agilent F. counter, Rubidium reference, DSOs (4) , Sig gens - HP4432B? Digital, 6 1/2 digit DMMs, LCR meters, micro wattmeter (Boonton 4510), precision RF 50Ω loads, precision attenuators. Bird 43 with H band slug, 50W. ? All instrumentation gear good to 3Ghz or better.
--
AncelB, MIT EE6002

On Fri, Oct 6, 2017 at 01:50 pm, <m0icr@...> wrote:

(2) What is the latest version of Radiuno firmware and is there a simple guide to word each version noting that I am at v1.11

A lot of new functionalities have been added since v1.11. The latest version is v1.24
See for a complete overview of all releases.

73 Allard PE1NWL

There is an unrar application for?Linux. It may already be installed on your system, but you may have to use the command line in order to use it.

Ashhar, back in?/g/BITX20/message/33203?p=Created,,45M15A,50,2,0,14278989?you mentioned either the 45M15A or 45M15B - both are available on Aliexpress. One has a slightly higher insertion loss, but is a 4 pole vs. a 2 pole filter. Is there any benefit to using the "B" version vs. the "A"??

Thanks for the agc link, WB5YYM, but I need to reboot! I run Kubuntu (Linux), and its 'uncompresser' is Ark which can't handle .rar files. :(? Back to usloth windblows - 10th iteration kludge of munged CP/M ...