For what it's worth, Brian, L11 through 22 are low-pass filters and there are a number of ways to do the job. You could use filters from your favorite source or project - from the WA2EBY linear to QRP

#ubitx

This crystal set has a 48 Hz span. I gathered the correct data from them, modeled the filter in the G3UUR tab of DISHAL, then tweaked the DISHAL numbers for the capacitors I used in order to get the i

One thing's for sure, we can tell who reads the traffic via email and who reads on-line as a forum. hihihi We've got plenty of copies now. https://groups.io/g/BITX20/message/36152 https://groups.io/g/

Ok...let's try this again. https://web.archive.org/web/20111018093646/http://w7zoi.net/lpf-expts/lpf-expts.html On Wed, Dec 20, 2017 at 12:00 pm, AndyH wrote:

Sorry...local link. Now that I've finished a cup of coffee, I'll see if I can find a link that works.

Greets jean-Matthieu, You might find this to be useful. It's the W7ZOI piece Ashhar credits for the µBITX filter: file:///D:/SSB%20Radio%20Files/W7ZOI_Low-Pass_filter_lpf-expts.html Best, Andy

'Morning John, Thank you very much! I've been reading and searching in order to figure out how VK2SJA selected the the resistor values for his resistive terminators - and there it is in the eham threa

EDIT...sorry, I'm reading 200Ω for crystal filters, not 2K. It's only a zero. hi hi

Hi John, I appreciate your comments. I agree that the first option isn't going to fly. I saw the changes in the noise floor but at this point in my 'crystal kindergarten' I don't grok the significance

The QRP-Labs Ultimate3S has that capability (GPS integration, Maidenhead, time, freq) and it's got an Arduino in there. It's at least possible.

You'd only need one of the amplifiers in each bi-directional pair. My take (I'm also working on an RX build) is that since everything has 50Ω in/out, we can think in 'module' terms. Here's a look at t

#ubitx

The IDE is fine, I think. When I'm on a Windows box, I edit in Notepad++, use Examdiff when it's useful, the paste the code into the IDE. The IDE helps get more people using the tech - that's a good t

Thanks again, sir. These filters are curious beasties. I'm having too much fun playing with them. DISHAL predicted a 100Ω impedance for my second build (100pF caps). I ran the numbers for an LC match

I hear ya. This from the reissued EMRFD, page 7.10: There's a table below that paragraph the summarizes resistors tested with an HP-8714 network analyzer. The two resistors with the lowest inductance

David, I used a metal oxide to make the pad when I built my WA2EBY linear earlier in the year and I have six extra. They're Mouser 281-130-RC. If that'll work for you, let me know where to send a pair

Shrink wrap. http://bitxhacks.blogspot.com/2017/02/heat-shrink-tubing-for-fatter-pot-shaft.html

Also Nigel, the first batch of µBITX sold out in a couple of days. They went to 'preorder' status on the 11th or 12th, I believe. So your order on the 16th will be in the same batch I'm in - the ones

No worries, Vince - thanks very much! Andy

Sorry...the file names didn't make it into the post. The top picture that could be a glove is with the 4:1 transformers installed. The bottom one with the much smaller ripple has no matching devices -

Thanks Ashhar. I'm enjoying the learning. :) I have read W7ZIO's paper a couple of times and am understanding more of it now that I'm melting solder and getting more comfortable with DISHAL. Frankly,