Normal view
Another one
I've decided to make the 4States QRP Group 4S-Tuner the official tuner of the W2LJ QMX Portable Ops bag. So I ordered another one for the shack for when I use the HW-8.Β This way, I don't have to keep transferring the one I have back and forth between car and shack.
I really, really like the function of the two LEDs.Β Great design feature by David Wayne Cripe NM0S!
When the red one is bright and the green one is out, the SWR is too high. When the two LEDs are of equal brightness, you have a 2:1 SWR. When the green LED is at max brightness, and the red LED is at minimum brightness or out altogether, your SWR is around 1:1.
This is a T-Match Tuner and I find it a bit easier to use, having the inductor in the circuit. Nothing against the ZM-2 as it is a wonderful little unit and will stay in the KX3 bag, should the autotuner fail for whatever reason. But sometimes, I just have a bit of trouble getting that single red LED to dim. I guess it's range is just a little narrower than the 4S-Tuner.
I already know it works well with my KM4CFT EFRW antenna. This weekend, time and weather permitting, I'd like to see how it handles the AX1 from our patio tabletop - a simulated POTA activation. Have to practice, just like the astronauts did! HI HI !
Onto another subject, with all the CMEs and solar flares that have been occurring the past few weeks, I saw this photo on Facebook, taken just yesterday, from the 1,000 Islands region in Upstate NY.
72 de Larry W2LJ
QRP - When you care to send the very least!
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Modularity in Off-Grid Field Radio
F600 β a 600W low-pass filter board for 1.8-72MHz
This design offers a practical solution for HF/low-VHF amplifier output filters, handles 600W and is designed to cover all amateur bands form 160m to 4m. It is a necessary accessory for the 600W HF/VHF LDMOS linear amplifier in order to removeΒ any harmonic products and make the amplifier legal to use on the air. Challenges For [β¦]
The post F600 β a 600W low-pass filter board for 1.8-72MHz first appeared on QRPblog.A 600W broadband HF amplifier using affordable LDMOS devices
Update: this project is evolving. See this page for the latest version. Kits are available in the shop area. The announcement of the MRF300 and MRF101 transistors by NXP in 2018 has generated quite a spark of interestΒ in the amateur radio community and as soon as I learned about them I wanted to get some [β¦]
The post A 600W broadband HF amplifier using affordable LDMOS devices first appeared on QRPblog.