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HW-8-TR QSK T/R Switch
|HW-8-TR board||Parts Kit||Installed in an HW-8|
Need to replace a bad relay in your HW-7 or HW-8?
Tired of the clank-clank-clank sound throwing off your sending?
Want to go QSK to hear between the characters?
Need a general purpose QRP T/R switch?
The HW-8-TR board may be the cure! This solid state replacement board was designed to drop right in place of the HW-7 & HW-8 relay. Included on the board are transmit and receive LED’s which can be remotely mounted. With this board and a few simple modifications (parts included) your HW rig can perform quiet operation with QSK.
A few notes, good and bad, about the relay board:
- In receive there is a slight loss of < 6db, typically < 3dB depending on your setup. That may sound like a lot but it’s really about <1/2 to no more than 1 S-unit. For the weak signal hunting in the noise floor nothing beats a mechanical switch but for the casual QRP QSO you probably won’t notice the difference.
- Although the board was designed as a drop fit for the HW-8 relay, it was also designed as a general purpose 5-10W QRP T/R switch for separate receivers and transmitters. It will work up to 20W and even “smoke tested” to 100W! We have also tested to board from 160M-10M with good results. See the HW-8 page for more details!
- Normally our kit designs are fairly easy to solder with larger pads and parts spaced apart a little. But due to fitting into the HW-8 relay area we had to use smaller pads with parts spaced closer together. This may not be a kit suited for beginners (the HW-8 audio board is a great beginner kit!) but some kit building experience, or a nearby elmer, may be needed.
Check out the HW-8-TR-V3-Manual.
(or here for the older HW-8-TR-V2-Manual).
See the TR board in action with the LED’s mounted behind the S-meter on this video.
For Assembled units select with LEDs soldered onto board or left out for remote mounting.