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Hi all.
I just released my latest low power, low cost WSPR transmitter.
This one has a built in GPS with built in antenna and is optimized for low current consumption and weight.
It can be powered from a single LiPo or from USB.
It cost only 39$ and operate on a single band as set with a low pass filter (sold separately).
Any band from 137kHz to 70 MHz
More info here : https://www.zachtek.com/product-page/wspr-tx-mini-transmitter

In the past week I've been using the new loop by ciro.The loop is on the lawn surrounded on the south by trees and houses to the west. The ear is at 1:3 to 1 using around 15 watts on different bands .

Regards

Brian

After much procrastination, I finally got my TAPR 30m tx connected to an antenna yesterday.

I didn't really expect much from 200mW going through an MFJ 945 match, a 9:1 unun and about 16m of wire slung off a 2nd floor balcony and temporarily lashed to an unsuspecting tree.

And roughly 12 hours later, here I am with hundreds of spots. Most are in Europe, but the best DX was a couple of VE's at over 8000km. WSPR (and TAPR): thank you. This is cool!

Doing an overnight test on 474Khz. Running an Hans Summer U3 at about 0.5 watts into a long wire (approx 40M) to get a base line before i make improvements. Estimated output is 1mW EIRP. Its probably a little lower though.

Just finished my first test of my RPi model 2B with it's attached TAPR QRPi Hat, employing a BPF, FET amplfier and LPF. Tx signal strength was ~33dBm, operating for 24 hours on 20M 14.0971MHz. Reception spots are logged from as far west as California and many inbetween. No EU spots that I can see.

Thanks all and Thanks to JT for the programand TAPR for the Hat.

I rented some rural accommodation over the weekend (9/10 March) to get away from the city noise for the RSGB Commonwealth CW contest. After the contest ended (Sunday 10:00z) I ran WSPR overnight until Monday morning. The 20-30 dB reduction in noise made a huge difference. I usually struggle to decode any NA stations on 40M long path from my city QTH but in this quiet location I could decode many NA long path stations until 3 hours after sunrise. I was using a full size quarter wave vertical (2 x elevated radials) on 80M and a multi-band dipole (20mh) for 40M and 20M.

At first I thought it is a joke, that a bare RasPi should work as a WSPR transmitter.
OK, I quickly burned an image, tuned my matching network to 160m, soldered a low pass filter and BANG! I couldn't stop stunning at the results.

This really carried me away and I also started tests on 40m with the same antenna. Here on 40m I could bridge the Atlantic, but comparing results 160m still seems to be more interesting.

I'll try to build a small PA with a BS170 and I'm already curious about the impact on 160m.

Hello everyone, I am finally getting in to WSPR. I tried it over a year ago, but did not quite understand it. Now that I understand it, I'm going in!

Here goes nothing!

Hello,
Just finished this new kit. Maybe can be interesting for experimenters.
Check my website for more info
http://jackdev23.wixsite.com/iw2ndh-swr-analyzer

Sorry for transmitting wrong output power on February, 20, 2019.
It was 1 Watt all the time, not 0,001 Watt due to a notebook malfunction.

Watching 80 meters at 2AM local time here. Not a lot of spots on others, but it is mostly consistent. A short list of the same stations repeating. I am getting the usual stations seeing me, but these must be set up with very good rcv antennas. But I will take whatever I can get.

After watching wspr for some time now, it seems to be developing its own kind of intelligence between stations. I wonder that the community of wspr is a sort of "hive" mind that is fully aware of the other stations, and is even connected with the RF physics of Earth to promote the communication channels that it wants.

Because the human owners of the stations are largely out of the picture, other than the rote setting up of the equipment, it is left to the emf physics to determine who is heard by whom, and then it begins a sort of machine language between the stations.

Okay I have been writing and sort of occasionally glancing at the wspr results. Have had it on 80 meters through the night as usual. At the moment 80 looks active. 2-3-4 spots on my signal per transmission. I am showing trending up with stns that i hear. 5 decodes between my 20% packets. So that looks good to me.

I will occasionally submit heard spots now. I have an IC-9100 and want to see what I can hear on 20m and other bands.

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