WSPRLITE FLEXI & BAND PASS FILTERS
I've been after a WSPRLite Flexi for months, but they've been unavailable on the SotaBeams website with no stock-update available. Presumably it's due to the global shortage of components. I saved a search for one on eBay but have received zero notifications, so obviously, when someone buys one, they tend to keep it!
Thankfully though, I popped onto HamRadioDeals at lunchtime and was lucky enough to catch an advert which was just minutes old! I quickly messaged G7UFO and snapped up this rare little beauty. The sale included a 3 BandPass Filter board which saves me some money.
So what is a WSPRLite?? Well it's described as an Antenna Performance Analysis System. It's basically a tiny test-transmitter (or beacon, if your prefer). You can attach it to your antenna and leave it running over a period of days (up to 45) and it will transmit up to 200mW WSPR signal every couple of minutes and hopefully be picked up by WSPR beacons all over the world. You can then go look at how well your antenna performed on DXplorer.net. You can also use it for real-time propagation reports and that's probably going to be its biggest use by me. You can use this system to spot openings for rare DX. If someone has heard your 200mW signal (or less) thousands of miles away, there's a good chance you can have a qso with them at 'normal' power levels on your transceiver!
The unit is roughly 2" square and has a micro-USB for power/programming at one end and a female SMA antenna connection at the other. That's it! Unlike the earlier version (the classic), the Flexi has no passband filters inside, so it's recommended to introduce some externally and SotaBeams facilitates this with a PCB kit which allows you to decide which filters are important to you.
The board which came with mine has filters for 80M, 40M and 15M which isn't what I'd have chosen, so I've ordered another board to give me 20M and 10M (it includes 15 by default so I’ll be doubling up, I know).
The previous owner mounted the WSPRLite and PassBand onto a perspex base to keep them together and provide a stable platform. It's a great idea but I'll probably look for a different solution when I've built the second filter board.
The extra PassBand Filter kit arrived along with a USB "Stay Alive" dongle. The latter stops the USB Battery Packs from falling asleep inbetween the WSPRLite transmissions. It's pretty much a necessity!
|On my EFHW-1 (20ft above ground)|
Dimensions :- 40 x 50 x 10 mm
Beacon power: 200 mW (software configurable: 5 mW - 200 mW); 6m limited to 100mW
VSWR: better than 3:1 recommended
Maximum reverse power < 100 mW (power levels above this will damage the WSPRlite's USB chip)
Bands covered: 630-160-80-60-40-30-20-17-15-12-10-6 m
USB current: 150 mA maximum (5 Volts).
Antenna connector: SMA socket
Power connector: micro USB socket (lead supplied)
Great work Tom, pleased you're getting some good use from it!
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