开云体育

Folks, as there is a lot of discussion on toroid winding etc, I would like to recommend purchasing a low cost L-C meter to measure your actual values for your various toroids to minimize winding

Those are the components that will be going into my 30m QCX, so no, I'm not going to cut leads short until they are in their final positions on the PCB. If you have access to that equipment and want

I have a real simple AGC circuit that works perfectly with this kit. Im on vacation this week but will publish it when i return to my office next week. It uses a transistor and diode charge pump to

Looking good!? I switched over to 30m WSPR/JT9 for now, before US3-19 runs out of sunlight this late afternoon; think I'll leave it parked there tomorrow and see if I get any spots.? I had added

Hi all For those of you who are not subscribed to the email so didn't see it: QRP Labs November newsletter is out, see the online version at http://www.qrp-labs.com/newsnov2017.html Topics: 1. QCX

What I can see from the pictures is: 1. the leads to the caps are very long giving an extra L -- so pleqase keep the leads of the coils and caps short! 2. measure the return loss of the filter i.e.

Alan, Most of my experiments with Class E have been with the Scopematch designed by M0BMU. As with other kits produced by Hans it is best to build it as per instructions and then investigate if it

Hey guys, When I measure RF output using the internal watt meter, I get 3.3 watts. The rig was loaded into a dummy load. When I use my mobile antenna (SWR 1:8/9) I only get 0.15 watts. I know 1:9

Peter G0DZB To add to your analysis, you can add a separate 1-turn link to your toroid and run a small amount of current through it to alter the permeability and thus the inductance. This is an

Hello Alan, When you made your power output chart was that after the LPF? Yes, I'm just putting a 50 ohm dummy load across the antenna output and looking at the output with my 'scope. Julian G4ETS

To VA3RR Many thanks for answer! I hope in a short time too I will become a happy owner of QCX!? 73! Anatoly UT5ULX 2017-11-09 17:58 GMT+02:00 va3rr via Groups.Io <va3rr@...>:

The micrometals web site http://www.micrometals.com/materials_index.html has this to say on the subject: "The cores are manufactured to the AL values listed; the permeability for each material is for

Hello Hans! Thanks a lot for fast positive answer!? I had no any doubts concerning band pass filter! I was just afraid that there is an artificial limitation of the synthesizer frequency band

Jim, Look at the assembly manual section 5.10 73 Alan G4ZFQ

This is explained in 5.10 of the assembly manual. In the U3S and other class C designs the inductor at L4 is just a choke to feed DC power to the finals. The QCX works in class E and the L4

Looking at the schematic, L4 appears to be a decoupling choke that works along with the .1uF capacitor C32 to keep RF off of the PA VCC voltage supply line coming from the transistors in the key

Hello Anatoly It covers the whole of 20m. The typical band pass filter response is shown near the end of the QCX manual. It is plenty wide enough to cover the whole of 20m. The same applies also to

Anatoly; The receiver bandpass filter properties are shown on page 133 of the assembly manual.? I believe that QCX will cover 14.0 to 14.25 MHz.??? My experience with the 60m version indicates

OM Anatoly, I am also interested in any answer to this, from those with QCX on 20m what difference between 14001 and 14349? Is in Ukraine only allowed up to 14250? I thought all countries had

Dear Colleagues! I intend to purchase the device QCX-20m for CW operation. Unfortunately, I did not find the information about the width of the frequency range. Could the QCX works in the entire