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Hi Colin Please see http://qrp-labs.com/ultimatelpf.html , I have just added this information to the page. 73 Hans G0UPL http://qrp-labs.com rotbaron77@...> wrote:

Hello gang, Continuing my quest to complete the multi-band 5W Tx/Rx project, I just got my latest batch of kits in the mail. Included was the Relay Board revision 5 which now has as "normal" the

I changed the circuit and program to support switched lowpass filters.? The program is written to support 3 filters.? I uploaded another circuit diagram.? The new circuit could also be used without

Hi Glen, Any thing is possible. Taking a clue from your subject field. It will not prevent Transmit function though. There are no Transmit / Receive relays or PIN Diode switching in this design. Look

Could Q5 be open? Can I jumper Q5 to see if I can hear a signal without further damage? Glen N8WE

Hans I have fitted stereo jacks to the keys and they do work in the stereo socket. I confirm that?the green wire was cut internally in the Palm Radio PPK straight key to avoid shorting between ring

I've been running my 40m QCX on WSPR for the past few days and thought I'd comment on the start-up behavior I'm getting with my QLG1 GPS module. My QLG1 when it's first powered up can take about 30-40

a while ago someone asked how others were connecting the GPS unit to the QCX. I have just done mine and it seems to work just fine. I bought two TRRS jacks and a TRSS to TRSS cable from Amazon. (The

Euan, You may like to read Hans' guess at the reason. /g/QRPLabs/message/17690 It would be interesting to see if he is actually correct, removing turns to make the LPF more efficient.

Same here! Excitement mounting.(S.N. 2383) I've already built one, and it worked beautifully until I messed it up. Soon I'll be able to use my new one to compare voltage readings, waveforms etc. and

Hans, Is this still on the agenda? ?Auto detect would be nice but a menu option will do. Regards Simon VK3ELH

On key down at low supply voltages there is a lag before reaching the final power. Example: For a 11.5V supply it starts at 1W, and there is a delay of several seconds before a fairly rapid increase,

Hi all This is a monthly reminder of guidelines for posting to the QRP Labs group. Keep these guidelines in mind when posting to the group. 1. Remember your email goes to up to 2500 people - so ask

This checker is ready build , not a kit , for 45 Euro? (-: 73 John

Here is a FB copy of the AADE : http://www.pe1acb.nl/diversen.htm 73 John

Hi Sean 10K is correct. See http://qrp-labs.com/qcx/qcxfaq.html#trimmer 73 Hans G0UPL http://qrp-labs.com

I'm working through a build of the QCX, and noticed that the trimpot in my kit (R47) may be incorrect - it is marked '103' (10K value)? instead of '104' (100K value) as the instructions call for.?

Several years ago I built several SMDR kits, I had bought a Commercial type LC meter but it wouldn't read the coils, then I found out about the AADE LC checker kit, easy to build and all of us that

They exist. Well, not perfect, but quite good. They're called Vector Network Analyzers. They can give you very precise measurements of resistance, capacitance, and inductance over a wide range of

The trouble with all of these LCR meters is rarely do they test at frequencies where you will be using the parts. The best solution ive found is to set up a test jig with my spectrum analyzer with a