Build of Version 2 of 15-10 Meter SSB Transceiver -- An Annoying Residual Carrier Problem
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- Опубликовано: 3 окт 2024
- Front panel is on. RF PA is installed. Balanced Modulator problem fixed (?). Rig is on the air with about 3 watts, working lots of DX.
But there is an annoying amount of carrier that is still getting through. It is only about .5 watts with sidebands of 100 watts PEP, but it annoys me, and it makes the setting of the carrier frequency in relation to the filter passband very critical: If I set the carrier a bit too far from the passband I get improved carrier rejection (from the filter), but I also lose the lows in both received and transmitted signals -- the RX just doesn't sound as good. I see the in both of the 15-10 rigs (IF of 25 MHz). There is less of it in the 17-12 meter rig (IF of 21.4 MHZ), and none of it in the Mythbuster (75-20 meters) (IF of 5.2 MHz). I am now wondering if this might be a consequence of my using a very high (25 MHz) single conversion IF in the 15-10 rigs. What do you folks think?
From my log:
March 7, 2024 PUT VERSION 2 of the 15-10 RIG ON THE AIR!
10S 1528 OK2RZ Jiri - said I was 57!
15S 1539 S52WW 58 Damian.
15S 1602 SP1NQH Stev said I am big signal!
10S S58N 1726Z
10S S57S 1728Z
10S IK4GRO Lauro 1735Z
10S W0CJV 1825Z Ft. Collins Gary
10s 2000Zish KK7TV Gary in Randy. Asked what software/microcontroller I was using.
10S KJ5MFF 2015Zish a middle school in New Mexico. KI5MFF control op sent picture
Im cutting plexiglass for my SSB 6.1 build. Good work!
It looks great Bill. Well done
❤ love it!
Thanks Bill
Hey Bill. Love the videos and podcasts. I have a question for you. Do you or any of your other genius friends know of someone who makes a really good sounding CW keyer? Some sound really terrible with very clicky attacks which I end up hearing more than the tone. Surely you could convince someone like Moog to make a really nice sounding keyer with adjustable oscillator and ADSR etc? It doesn't feel right using a $200+ paddle through a $2 keyer. Any thoughts?
All the best to you and yours,
Thanks for your time
73
Patrick, M0YZX
Patrick: I rarely use CW, and when I do it is with a straight key, so I am really the wrong guy to ask. But maybe someone here can make a recommendation. 73 Bill
What about Varicap diodes and a large value Multi-Turn pot to give a nice wide tuning capability.
I've found that varicaps can actually be less stable than ordinary variable capacitors. Besides, I have the needed variable capacitor.
what about using 3x12AX7 vacuum tubes as a Cross Coupled Double Balanced Mixer which should work as a modulator with gain and should work as a demodulator again with gain with a B+ of 50V and a Heater voltage of 12V, if you want a look then here it is Angelfire/Double Balanced Mixer using vacuum tubes
Well, this is a solid state project.