I find that large Dixie cups make for much higher fidelity audio. Jim W4JED

#antennalaunching #building #qcx40 #sota #transformer

Those ultra-mini transformers on BNC connector are very cute, but have one major drawback IMO. Because they are attached directly to the TRX, therefore they are at the ground level when oparating. Alt

#antennalaunching #building #qcx40 #sota #transformer

I haven't tried them, but these are available and lightweight. The owner is a pretty stand-up guy as well! https://checkout.tn07.com/

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I made few portable mini dipole and w3dzz for portable use Best Regards, Stein-Roar Brobakken post@... LB3RE K3RAG Skype: lb3re.rag

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Interesting and added effort. Consider this you have a QCX and battery plus key aaand all the usual stuff in you pack for a day maybe over night in the field, maybe a mountain. What does you antenna h

#antennalaunching #building #qcx40 #sota #transformer

SOTAbeams and QRPGuys sells trap kits. Price varies depending on how much power you want them to handle. I thought about this, but I went the simple route and did a 20/30/40 linked EFHW. 0dB insertion

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Steve, Great information! Nice tips included also. I think I'll give this a go myself. Michael

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Attached please find two vidios that I found helpful for making a 1/2 wave end fed antenna so an extra tuner is not required. Hope you like it. https://www.youtube.com/watch?v=s-_LyhdGapM https://www.

#antennalaunching #building #qcx40 #sota #transformer

Great results there, Axel. We'll be running off coin cells soon 😁 I've used the Recom DC-DC converters in my QCX kits and also dropped the LCD backlight brightness way down which has brought current c

#qcx #solution #sota

BTW. The LT1366 is a bit expensive but there are other opamps that are much cheaper and approach the same success. You just have to consider that IC10 has to bring around 20mA-30mA ... but with IC6-IC

#qcx #solution #sota

Hello Kees, The R48 change (from 270 to 1k5) saves 15 mA. Each opamp (IC6 to IC10) requires 10 mA ... the LT1366 requires 0.7 mA (I didn't change IC5 because low noise is important). So let's say this

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Axel, I have been quite satisfied with the DC-DC converters I have used in the past from a noise standpoint. Do you have data as to what the effect was of each change. I was going to make the backligh

#qcx #solution #sota

Hi, i assembled my QCX + a few days ago and made some optimizations regarding the power consumption. Maybe it helps someone who wants to use the QCX mainly portable. Changes: -LM7805 replaced by Traco

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Thank you you both for the clarifications. I know what to put in my shopping cart now ;-)

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Hi Ben Yes sorry. My bad. Too little sleep :-/ Temperature Compensated Cryatal Oscillator Apologies for the confusion 73 Hans G0UPL http://qrp-labs.com

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I thought TCXO stood for Temperature COMPENSATED Xtal Oscillator. No? Ben

#qcx #sota

Hello Serge TCXO = temperature controlled crystal oscillator OCXO = oven controlled crystal oscillator The QCX+ TCXO module option http://shop.qrp-labs.com/qcxptcxo has a current consumption of 1.25mA

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A quick question for the portable QCX+ operators among us: What is the current consumption impact of such a temperature controlled cristal oscillator (TCXO) oven?

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Curt, Checking would be good. 5A at 20V would be 100W and at 70% efficiency minimum thats 70W out. I did that as a does it makes sense number. Typical input is abut 3.5A at 20V or 70-72watts DC and 50

#sota

Thanks Curt. I'm not too worried about the 5 amp current requirement. If you go high enough on the C rating of the battery you should have plenty of headroom. I'm just curious how hard the upper 22V u

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