Not wanting to bother the genius who is hard at work (Hans), has anyone heard an update on the QSX? I am writing a speaking proposal on SOTA for the Rocky Mountain Regional Conference in Utah in Augus

#sota #qsx

Hello John. No doubt that most folks interested in a multi-mode, multi-band rig have already seen this: http://qrp-labs.com/qsx.html Be sure that they read the entire page. Should be enough to wet eve

#sota #qsx

I'm nearly finished with my latest 40m QCX build, and I thought I'd share it. I smuggled a small parts box home from work and planned on converting it to an entire self-contained station. The plan is

#qcx #case #sota

Nice work on the case! I use a KX Single Lever mini-paddle from the QRPGuys. I rewired the socket for a 3.5mm stereo plug on a few inches of three conductor wire from model train world. Just finished

#qcx #case #sota

I've built several small and light paddles. This one was my lightest so far (only 9 gram, and that includes the cable !) Contacts from a relay and a stripe of pcb, sticking to the QCX with blue tack.

#qcx #case #sota

I found that the small switches like those used in the QCX will also make contact when moved sideways. With that in mind I mounted two on an inside corner of my QCX case. They work like a paddle, are

#qcx #case #sota

I made one similar to your "grayboard" and thumbtack invention, but with double-sided pcb and bent paper clips instead, surrounded by 1mm bent plastic. I found i operated more comfortably with the pad

#qcx #case #sota

I'm currently building a QCX 50w amp for 20m to match my QCX transceiver. Will a 6S Lipo battery be too much for the amp? The 6s packs are 25.2V fully charged.

#sota

Evan the main factor might be the current capacity of those batteries - I recall something like 5 amps may be required? check Hans clear instructions on voltage and current. note the amplifier is a hu

#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

#sota

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

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?

#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

#qcx #sota

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

#qcx #sota

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

#qcx #sota

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

#qcx #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

#qcx #solution #sota

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

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

#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