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    Nice Video and paper on 40m band propagation using WSPR.
    Harry Zachrisson
    • Apr 29, 2020
    • 1 min

    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...
    734 views0 comments
    A new WSPR transmitter for Balloons
    Harry Zachrisson
    • Feb 1, 2020
    • 6 min

    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...
    2,952 views1 comment
    Improvements in version 0.82 of the configuration software.
    Harry Zachrisson
    • Jan 8, 2020
    • 3 min

    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...
    550 views8 comments
    Using the earth as an antenna? F5VLB Earth Probe testing.
    Harry Zachrisson
    • Dec 2, 2019
    • 3 min

    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...
    1,321 views0 comments
    Video review of the WSPR Desktop transmitter
    Harry Zachrisson
    • Nov 24, 2019
    • 1 min

    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...
    514 views1 comment
    Sunday repair - Broken knob on brand new FT-857D Transceiver.
    Harry Zachrisson
    • Nov 4, 2019
    • 5 min

    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...
    344 views1 comment
    New revision of WSPR Desktop transmitter
    Harry Zachrisson
    • Oct 27, 2019
    • 2 min

    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...
    855 views17 comments
    WSPR Desktop Transmitter in Tanzania
    Harry Zachrisson
    • Oct 4, 2019
    • 3 min

    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 ...
    651 views0 comments
    YouTube video. WSPR on 6m by Hayden - VK7HH
    Harry Zachrisson
    • Aug 13, 2019
    • 1 min

    YouTube video. WSPR on 6m by Hayden - VK7HH

    Hayden - VK7HH have built a 6m WSPR beacon using a WSPR TX_LP1 and have done a really good job putting it together in a high power...
    187 views0 comments
    Polar Research vessel Oden gets a ZachTek WSPR transmitter.
    Harry Zachrisson
    • Jul 3, 2019
    • 9 min

    Polar Research vessel Oden gets a ZachTek WSPR transmitter.

    WSPR is a great way to explore and test a wide range of stuff in our wonderful radio hobby. Although I guess most of us use WSPR casually...
    836 views1 comment
    WSPR Mini - the new small WSPR transmitter that can run from a LiPo battery.
    Harry Zachrisson
    • Apr 9, 2019
    • 2 min

    WSPR Mini - the new small WSPR transmitter that can run from a LiPo battery.

    I have now completed construction, testing and build of my latest WSPR Transmitter. I call it the WSPR Mini! It is only 41x56mm in size...
    799 views2 comments
    Video on the WSPR-TX_LP1 with the Mezzanine LP4 add-on card.
    Harry Zachrisson
    • Mar 16, 2019
    • 2 min

    Video on the WSPR-TX_LP1 with the Mezzanine LP4 add-on card.

    YouTuber Kevin Loughin did a great review of the WSPR-TX-LP1 transmitter with the add-on card Mezaninne LP4. As Kevin is a Linux only...
    238 views0 comments
    Discussion Forum and other news.
    Harry Zachrisson
    • Feb 17, 2019
    • 2 min

    Discussion Forum and other news.

    Hi all. Forums! I now have a Forum for discussions and support. You need to login to members page to access it. It is open for everyone,...
    214 views0 comments
    Add-on for the WSPR-TX_LP1 giving it four switched lowpass filters
    Harry Zachrisson
    • Jan 16, 2019
    • 3 min

    Add-on for the WSPR-TX_LP1 giving it four switched lowpass filters

    The Mezzanine LP4 is a new add-on that expands the WSPR-TX_LP1 transmitter to four bands or more (US users can use more bands with...
    389 views0 comments
    New WSPR Transmitter product
    Harry Zachrisson
    • Nov 8, 2018
    • 2 min

    New WSPR Transmitter product

    I just released my latest WSPR product. It has been a very long journey to complete this one but it is finally here. The Product is...
    1,329 views0 comments
    VK3KHZ modifes the WSPR-TX_LP1 to dual band transmitter.
    Harry Zachrisson
    • Oct 22, 2018
    • 3 min

    VK3KHZ modifes the WSPR-TX_LP1 to dual band transmitter.

    Paul Karlstrand with radio amateur call sign VK3KHZ in Australia was one of my early customers of the WSPR-TX_LP1 transmitter. He...
    384 views0 comments
    Video review of the WSPR-TX_LP1 transmitter by VK3YE
    Harry Zachrisson
    • Oct 22, 2018
    • 1 min

    Video review of the WSPR-TX_LP1 transmitter by VK3YE

    Peter Parker (Amateur call sign VK3EY) in Australia tested my newly released WSPR transmitter. Check out his review here:...
    336 views0 comments
    Documentation page for the WSPR-TX_LP1
    Harry Zachrisson
    • Oct 22, 2018
    • 2 min

    Documentation page for the WSPR-TX_LP1

    I have written a documentation page for the WSPR Transmitter WSPR-TX_LP1 and and tried to make it as complete as can be at this time. ...
    275 views0 comments

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