XPost: rec.radio.amateur.moderated

KB6NU's Ham Radio Blog

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You never know what youre going to find.

Posted: 20 Feb 2022 09:52 AM PST https://www.kb6nu.com/you-never-know-what-youre-going-to-find/?utm_source=feedburner&utm_medium=email


I was puttering around the shack yesterday, putting some stuff away and throwing out stuff that Ive either finished with or will probably never get back to. In doing so, I ran across this:



Its hard to read, but the date of the 15 wpm endorsement is JUN 28, 1972, almost 50 years ago! I think that, just for fun, Ill try to qualify for the
30 wpm endorsement.

The certificate itself is really brittle, but I dont want one of the new
ones. I dont like the way they look with the Vibroplex key on them. Maybe I
can have this one laminated.

While I was at it, I decided to re-organize my small collection of ARRL Handbooks.



As you can see, I have the 1949, 1958, 1963, 1965, 1975, 1976, 1977, 1979, 1981, 1985, 1986, and 2000 Handbooks. Not shown is the six-volume 2022
Handbook that I purchased a couple of months ago.

Paging through these Handbooks really gives one a sense for the history of
the  hobby. For example, the 1948 Handbook has a chapter on broadcast interference (BCI). Now, wed call that radiofrequency interference (RFI) or electromagnetic interference (EMI). Also, I didnt find any information on
RF exposure in the 1948 Handbook.

The post You never know what youre going to find. appeared first on KB6NUs
Ham Radio Blog.


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Amateur radio videos: (tr)uSDX

Posted: 18 Feb 2022 01:49 PM PST https://www.kb6nu.com/amateur-radio-videos-trusdx/?utm_source=feedburner&utm_medium=email


So, a couple of days ago, a guy in our club posted to our mailing list that
he was thinking of starting a group buy for the (tr)uSDX transceiver
and  included a link to the video below:


Heres a description of the little transceiver:

The (tr)uSDX is a 5-Band / Mulitmode QRP Transceiver in Pocket Format (90x60x30mm – 140g). It features a highly efficient Class E PA and Supports CW/LSB/USB and AM/FM. Right now it covers 80/60/40/30/20m and in Future
there will be support for 17/15/12/10m as well.

It is supplied with an OLED Display, onboard Mic, (tiny) onboard speaker
and for improvised QSO onboard PTT Key can be used as emergency CW Key. Further on, the (tr)uSDX has a (Micro)USB CAT and Programming
Interface, and while it produces typically 5W @ 13,8V Power Supply, it can create 0,5W Output from 5V USB Supply alone.

Typically it draws 80mA on RX (with MS5351 – less with Si5351) and 500mA on TX @13,8V and typical 85% PA Efficiency. It is supplied with OnBoard SWR Bridge and Voltage/Current measurement Hardware, to help in tuning and operation.

Talking about the on-board test equipment, heres a short video on how that works:


The guy says that if we do a group buy, theyll cost about $60. That seems pretty cheap, since in single unit quantities, theyre selling for closer to $100. Heres a video of the designer unboxing a kit from one of the Chinese suppliers:


I dont know where the guy is going to be making the group buy, more than a dozen club members have signed up so far. I need another project like I
need a hole in the head, but Im going to get one, too.

The post Amateur radio videos: (tr)uSDX appeared first on KB6NUs Ham Radio Blog.

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