1 Battery QRP with QCX Mini Part 2 - Power Test ? !
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- čas přidán 2. 07. 2024
- QRP Labs QCX Mini with 1 small battery - how much power did it really make? QRP Amateur Radio and more -
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1 Battery QRP - Power Test
I decided to try making contacts ona QRP radio using just 1 9v Battery - and it was surprisingly successful - so - how much power was I really putting out?
In this video I show how I measured the QCX transceiver output and how it changed as the battery drained...
00:00 Introduction
00:50 How to measure RF output
01:57 Power from different voltages...
03:53 What I learnt from this experiment - 3 conclusions
06:11 What's Next?
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Links mentioned in the video:
Tuning up your QCX+
• Tuning up your QCX+
Measuring RF Power
www.qrp-labs.com/qcxmini/rfpo...
QRP Labs:
www.qrp-labs.com/
Bamatech TPIII Ultra Compact Twin Paddle:
www.bamatech.net/morsetasten/...
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Q26 Videos by Mortimer Rhind-Tutt - Jak na to + styl
Excellent series of videos, sir. Thanks!
Nice video going on from the previous one.
All QRP here, FT817ND, h/b h.f. ssb/cw rig, Wireless 19 Set 2 Watts cw on low h.t., one valve xtal cw 40/60m tx, Pye Bantam a.m. on 4m.
My Pixie, 350 mW out on 60m got me 180 miles QSO and a SWL report from 220 miles.
G4GHB
Mort, another excellent video on the QCX mini. I've got two 40 & 20 meter which I call Bada Bing and Bada Boom. I do quite a bit of Parks on the Air activations in the states via bicycle and find these little rigs with an EFHW are idea for my portable operations. QRP RULES!
QRPp levels, good show OM. 72 de AI5DD
This is a good follow up and very interesting, thanks! Would I be correct in thinking that during your lunch break, the battery was able to recover enough for a final fling?
Thanks! I'll have to try my QCX mini with a 9 volt battery, although I prefer 18650s.
I use 18650s too Michael, most of the time - really great batteries! (and Panasonic Eneloop on less power hungry devices). Glad you enjoyed the video, 73 Mort/G4BSK
Did you measure the battery voltage under load or open circuit? It should be measured while transmitting I think.
At the end of the QCX-mini instructions is a section on tuning the rig. Hans also has an excellent 45 min video on how to tune the QCX/QCX+/QCX-mini. As an example he used a 30M QCX+ and said that it is not at all unusual for the 20 & 30M radios to begin with low output power. The 30M radio he used in the video started with output power of 0.7W. After removing windings on one toroid and spreading wires on a couple of other toroids he managed to improve the output to about 4.3 W. At the conclusion of the video he was able to supply 13.8V and had RF power reading of 6.4W. After you tune your radio try the batteries again. I would like to see the result. We did our smoke test last night on our QCX-mini and NO SMOKE. In the middle of tuning it now. Search for this and you will get his video on CZcams.“How to optimize your QCX/QCX+/QCX-mini for best performance.” Thanks Joy
Hi Joy
I have linked to this video in the description and mention it in this video. In my other videos I show the tuning up process & make suggestions about preparing for it during the build. My three QCX txcvrs normally run at 5w or a bit more & are fully optimised. This video is just a fun experiment about low power and unsuitable batteries😀😀😀 I hope your build goes well & that you have a lot of fun with your QCX !
Very interesting video❗️73 KV5P
Try a rechargeable 9 V the battery your using has high internal resistance and limits output to about 1 watt, rechargeables will allow higher output at least for a while, find the highest capacity you can find are usually good for several quicker contacts like Pota, Sota, and contest exchanges, they can last longer than you may think good luck and lots of fun experimenting, 73 -J
👍❗️73 KV5P
Excellent video. I liked your one battery experiment very much. Now, there is a polarity protecting diode in QCX Mini. That drops the incoming voltages by 0.6V approx. What if you shortcut that? Then your power could be bigger also the battery would last longer...Do not you want to try this? 73 de Béla HA4BM from Hungary.
Thanks Bela - I'm pleased you liked the video and yes, taking the diode out is an option I have considered...73 from Mort/G4BSK
I think I'd keep the diode for safety, reverse voltage by accident is not good.
G4GHB
Try an eveready lithium 9volt. They really put out! It’s what I use in my 4state qrp crickets. And they last a long time. Don’t bother with those 9volt lipo rechargeables. de n5vwn