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Video on remote hilltop 6m WSPR installation.
Hayden Honeywood - VK7HH starts of 2022 with a video showing of his remote installation site and the ZachTek WSPR transmitters that is...
Harry Zachrisson
Jan 2, 20221 min read
1,224 views
3 comments

New features in firmware and Software version 1.10
Version 1.10 brings a couple of new features to my WSPR transmitters. Prefix or Suffix to the Call Sign. The user can now chose to use...
Harry Zachrisson
Sep 15, 20212 min read
1,761 views
17 comments
Firmware 1.2 fixes bugs related to short call signs
Firmware 1.2 is now released and fixes two bugs: The feature "Send precise location" only worked properly if you call sign was six...
Harry Zachrisson
Aug 14, 20211 min read
905 views
0 comments

New WSPR TX Desktop model. 80To10
I have just released a new Desktop model that covers all bands from 80m to 10m. This means it covers nearly all the bands that the...
Harry Zachrisson
Jun 25, 20211 min read
1,389 views
11 comments

New firmware supports long Maidenhead position reports
I just released Firmware 1.0 and PC configuration software 1.0 that is suitable for all WSPR transmitter models. Besides being the first...
Harry Zachrisson
May 16, 20212 min read
1,272 views
0 comments


WSPR Receivers redesigned and soon available.
My direct conversion receivers for WSPR was one of the first products I made and sold two years ago when I started ZachTek. It was a...
Harry Zachrisson
Oct 12, 20203 min read
1,891 views
5 comments


I measured the Noise Figure of the LNB in the PARI-O and made a video of it.
I have been curious of what the noise figure on the Golden Media GM-201 LNB is. GM-201 is the LNB that is included as part of my PARI-O...
Harry Zachrisson
Aug 17, 20201 min read
647 views
0 comments

Geo-fence for the WSRP Pico
In the latest firmware (0.92) I have implemented geofencing that will avoid transmission when a Pico transmitter and it's balloon is over...
Harry Zachrisson
Aug 14, 20201 min read
1,235 views
22 comments

Nice Video and paper on 40m band propagation using WSPR.
Hi. Jim -KX4TD - have used a WSPR Desktop transmitter to investigate the propagation on the 40m band. His explanation on what is going...
Harry Zachrisson
Apr 29, 20201 min read
975 views
0 comments

New Product. High stability 10GHz LNB
I have just released my new product, the High stability 10GHz LNB (PARI-O) This product solves the problem of drift in 10GHz LNBs and...
Harry Zachrisson
Apr 3, 20202 min read
553 views
0 comments


A new WSPR transmitter for Balloons
After a long development time I have now released my latest WSPR transmitter that is intended to be flown with small balloons. There is a...
Harry Zachrisson
Feb 1, 20206 min read
5,480 views
1 comment

Improvements in version 0.82 of the configuration software.
This Christmas holiday I took a break from building and designing electronics. Although I was suffering a bit from burn-out from working...
Harry Zachrisson
Jan 8, 20203 min read
637 views
8 comments

Using the earth as an antenna? F5VLB Earth Probe testing.
Jean-Marie Polard - F5VLB has been experimenting with so called "earth probes" to transmit RF on our amateur bands. He mentioned it to me...
Harry Zachrisson
Dec 2, 20193 min read
2,277 views
0 comments

User story from WM3E.
Carl - WM3E have done a nice write up of how he travels the US in his motor home with his wife. Like so many of us that comes in and out...
Harry Zachrisson
Dec 2, 20192 min read
304 views
2 comments

Video review of the WSPR Desktop transmitter
One of my Customers -Rob Wagner VK3BVW - have done a Video review of my WSPR Desktop product. Watch it here https://youtu.be/AXmzQP0VwZ4...
Harry Zachrisson
Nov 24, 20191 min read
830 views
1 comment

Oscar 100 satellite receiver on-line now
You can now listen to the geostationary radio amateur satellite Oscar 100 from a web browser. The receiver is using my latest product...
Harry Zachrisson
Nov 22, 20191 min read
856 views
2 comments


Sunday repair - Broken knob on brand new FT-857D Transceiver.
My FT-857 developed a fault the other month, it does not give any power out on transmit on SBB and AM, FM works fine though so the PA is...
Harry Zachrisson
Nov 4, 20195 min read
580 views
1 comment


ZachTek one year old, lets celebrate!
It is now one year since I started my ZachTek venture, I cant believe how fast the time have gone! Time flies when you are having fun as...
Harry Zachrisson
Oct 27, 20191 min read
141 views
1 comment


New revision of WSPR Desktop transmitter
I have just finished a new revision of the WSPR Desktop. The new revision use a different GPS module as I had beginning to experience...
Harry Zachrisson
Oct 27, 20192 min read
1,164 views
17 comments


WSPR Desktop Transmitter in Tanzania
One of the WSPR Desktop transmitters have found its way to East Africa running continuously as a WSPR beacon in Tanzania. André ...
Harry Zachrisson
Oct 4, 20193 min read
930 views
0 comments
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