KK4DAS SBITX 1st good QSO
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- Опубликовано: 27 авг 2024
- First QSO on my homebrew SBITX. The transceiver is now substatially complete. In the last few weeks I added a 5W PA, the switchable LPF bank, homebrew electret microphone, and redid the Tx/Rx switching to include the 30MHz roofing filter on both Tx and Rx. Still more peaks and tweaks but good progess.
KK4DAS Blog: kk4das.blogspo...
73 from Great Falls
Dean
KK4DAS
Sounds good. I have that speaker as well. I screwed an old Realistic scanner belt clip to the back of it 25 years ago so I could clip the speaker to the sun visor in my truck.
I picked up a pair of those speakers for $2 at the Vienna Wireless Winterfest last year. They are terrific little speakers and great for our applications.
Congrats Dean! Amazing job on the build. It sounds great!
de N0ZIB
Boy, that was very clear on your end. Unlike at my QTH, you have a very-low noise floor. Was that on 75M? --Todd K7TFC
Todd - yes - pretty low noise floor on 75M. And the receiver just sounds good. I can adjust the IF gain (the SBITX SDR equivalent of RF gain) such that the signal really pops out.
Thanks for the video. I'm planning on purchasing one of those rigs this coming week. Questions please: 1. What mic were you using? 2. I found out today that there is no Noise rejection feature. Is it needed? I might add a Clearspeech speaker. Thanks, again and 73 de WA3RSL
Hi Frank, sorry for the delayed response. The SBITX software has a feature called IF gain. You reduce noise by lowering the IF gain control until you just barely see the peaks of the noise floor on the waterfall. The microphone is 100% homebrew using a hi-gain electret mic element. The commercial rig has a built-in mic and speaker but also has provisions for an external mic and speaker.
@@kk4das122 Thanks for the reply and info! 73
Great build. How much power does it put out
Thanks. Power out is 5 watts across HF for now. I plan to build a 20 watt PA using Mitsubishi RD16HHF1 transistors.