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Thank you wn4isx! Your link to Martin G8JNJ's active antenna pdf very extensive: https://qsl.net/l/lw7dfm/Antenas/Antena%20Mini%20Whip/MARTIN%20-%20G8JNJ%20- %20Active%20antennas.pdf More

I found that one, https://www.pa3fwm.nl/projects/miniwhip/, but I have not found the second part one in the pictures that is discussed with improvements. I found this one that looks

After spending too much time searching and reading about active antennas and building a library, I visited Amazon. Search for "Mini-Whip Antenna". There are enclosed ones, but I ordered a promising

Pieter-Tjerk de Boer, PA3FWM has a series of articles on E-Field antennas that can be extremely helpful in getting the best performance from these antennas. Fundamentals of the MiniWhip

Pedid y recibiréis Simple and better circuit for MiniWhip antennas https://www.pa3fwm.nl/projects/miniwhip/ The 2SC5551A might be a viable substitute for the 2N5109 in the original PA0RDT

Thanks, I have no specific plans except testing the new technology and also look at GPS signals. I did a lot of work with GPS 30 years ago and I still have some active GPS antennas to try. The

Previously wn4isx posted a link to: https://www.pa3fwm.nl/projects/miniwhip/ The reference refers to an improved version but there is no link to it. Does anyone know where I can find the improved

What do you want to listen to? I might be able to offer some advice.

As I mentioned, I have one main program that was extremely expensive, cost me over $1000, I also routinely use Adobe Audition, while there are good audio programs for Linux like Audacity, they are not

Yes but I'd be forced to learn to use an Ardino, build a case, etc, the Dataq requies a USB cable and is ready to go, time saved at my age is well worth a few dollars.

Thanks for the introduction of SDRplay. I used to design commercial RF equipment but not for the last couple of decades. So I decided to buy the SDRply RSPdx-R2. Now I have to review the antenna

OK I am not pushing the SDRplay line of SDR (software defined radios) but I received a PM that prompted this post. Oh I have no relationship with SDRplay then as a generally satisfied customer. I've

I've run nothing but linux since 1999. And yeah, virtualbox is one way to go, this email client is running under Slackware 12.2 (because I like the older version of kmail) on a Debian host system.

You can do a whole lot better than that, and way cheaper: https://www.nutsvolts.com/magazine/article/March2014_Davis -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest

I suspect the HP units had a wider Vin and higher "oops" Vin but the Dataqs work as advertised, the Dataq software is amazingly flexible and the $79 Dataqs are extremely stable. The Dataq software can

* Faster op-amp. * An alternative differentiator that does not depend on an op-amp. Andy

My first job working for HP as a Systems Engineer with Data ACQ hardware as my support product. I recall it being a large box with plugin boards for relays, thermo couples, digital ins and outs.

If you have projects that require data acquisition Ebay has several options but the gold standard would be Dataq. They offer a variety of data acquisition units, some are analog only, some feature

Hello Andy ,I lowered the rise time to 5ns,As you can see in the attached photos. I have 437mV/14ns=31V/usec? which twice lower then?80 V/μs which described in the datasheet. How Can I improve the

Nice story. My left knee was replace about 5 years ago and I can kneel. Some folks say that they can not. This Friday I'm getting a shot in my right knee. The last shot was 4 month ago, that's about