Tag Archives: TNC

The BitX 20 & More

The BitX

20160618_120709I was fortunate to recently have been gifted a BitX 20 kit by a friend and fellow VE. The kit came from QRPkits.com some time ago, I believe at least a year or so ago.

My intention was to build it for Field Day 2016. Sadly, while I was well on track to getting the radio built, 2 parts were missing from the kit. BS170 N-Channel MOSFETs to be specific. This put on the breaks for the final assembly and stopped me dead in my tracks with the finish line in sight.

20160624_193754I have the parts waiting for me at Jameco will-call for Monday. Once I get them home, populating the remainder of the circuit board should take about an hour. Then its on to the initial tuning and getting the radio packaged up in its housing.

I will do a full project write-up in the Projects section soon, but for now just an update.

A Homebrew Signal Generator/Oscillator

20160622_084953During the BitX build I ran into a small hiccough. The testing at some point calls for the injection of an 11 MHz signal. I would normally use my Lafayette signal generator but for some reason it’s on the fritz so I had to come up with another solution… build an 11 MHz signal generator.

20160622_085219With the crystals in the kit it was easy to build a simple generator with parts on hand and while I only had 1 of the five crystals installed it was easy. By the next testing phase I had installed the remaining 4 crystals. Now I need one for the homebrew SigGen! (click the image for the circuit diagram)

Off to HSC Electronic Supply for some 11 MHz crystals.

This project will also get a write-up in the Projects section soon. This one in in particular has a lot of use in checking unmarked crystals as long as they are between 1 and 20 MHz and is a great foundation piece for beginning builders.

A Homebrew TNC

20160524_145401Before I got started on the BitX I was working on getting my Baofeng 2m/70cm HT on digital. I found a couple of designs for a homebrew TNC and set out to make that work.

Because of the way the PTT key works on the Baofeng I haven’t been able to make the TNC work with the HT but it should work fine with my 40 meter QRPme.com Splinter II and the BitX 20.

A full write-up post is coming on this one too.

Look for all three of these in the Projects section for full details on the builds coming soon.

It’s been a long time since I posted, and most of that time I have been working on non-radio stuff. Now that I am back in the swing of things I have more time for radio stuff so I should be able to post more, and make updates to the Projects pages

As soon as the BitX 20 is up and running I plan on getting the Lafayette working again and get back to the Beach 40 DSB. Another Field Day has slipped through my fingers. I don’t plan on that happening again!

That’s all for now folks, 72, 73, and good night!



First week of May

First week of may, and ain’t got much to say!

JT65JT9No build projects progressing, not much time OTA, none actually, but I have managed to get some reading in. I picked up a copy of one of the new ARRL books Work The World With JT65 and JT9.

Not bad, a short read, though I must admit, I don’t really see myself using the TJx mode any time soon. It looks like its pretty much a contesting mode. I’m not much interested in contesting until I get more of a station built up, and even then… I dunno.

HighSpeedMultiMediaWith some luck the UPS guy will bring me the also new ARRL book High Speed Multimedia for Amateur Radio book today. I still don’t have a TNC or HF radio up and running, but I do have some spare/old 802.11 units lying around… hmmmmmm…

There could be a project with HSMM on the horizon.

RTTY-PSK32I also have a copy of RTTY/PSK31 for Radio Amateurs 2nd Edition on the way which I think will see more action in the near future than anything else. I have a USB/Serial cable and enough toroids and cabling that I might fourgo the TNC a little longer and build an interface myself just to see if I can get it up and running.

The down side is that I will still only be running whatever digital mode on 2 meter FM rather than SSB, but that will get resolved at a later date.

ARRL-VEC VEIn other news, there is another VE session tomorrow (Saturday, May 7, 2016 08:00-10:00) at the Saratoga Fire Station. This session will be my 30th VE session!

Also this month, Maker Faire is here in San Mateo and I will be working both the morning and afternoon VE sessions at the faire. More info is available on the SF Bay Area Maker Faire VE Session website.

One last thing. I’m not going to post it yet, but since we have been planning on relocating, I worked up a new QSL card to reflect the new location. Once we are confirmed with a new QTH and Grid Location I will post a preview of the new card. Speaking of which, if you would like a QSL from my current QTH email me with your address and I will send one out right away.

Oh, one more thing… I am back to studying for my RADAR add-on to my commercial license.

I guess I have been doing stuff.