Yeah but your power output will be the same. It may take more power to produce AM high level modulation, but the net result in the final is exactly the same power dissipation.
That was my point, although there are extremly sharp (and expensive)bandpass filters using many stages that can have almost straight "brick wall" passband shape. However I've never seen a SSB modulator/demodulator circuit without either a balanced modulator or using phasing circuits to cancel the carrier frequency.
Lefty
No, I'm gonna use a ballanced mod. I wish I had gotten a CA3039.
You think so? Nigel says the 1496 is better. I have seen other sights saying the '941s are fine. So far I have gotten best results from the '914s in a diode ring but I got a 1496 chip wired up to try. I got the design from the ARRL handbook but I will be using 6 volts. So I may do a comparison but I really wish I had a schematic of a discreet transistor circuit of the differential amps. Thanks for trying to explain it guru.Yes Varmint, the diod ring produces the best results with the lowest amount of pain and let me quote from the good site you have mentioned earlier (**broken link removed**): "..don't even consider using 1N914 types if you want results.."
Regards,
xanadunow
You think so? Nigel says the 1496 is better. I have seen other sights saying the '941s are fine. So far I have gotten best results from the '914s in a diode ring but I got a 1496 chip wired up to try. I got the design from the ARRL handbook but I will be using 6 volts. So I may do a comparison but I really wish I had a schematic of a discreet transistor circuit of the differential amps. Thanks for trying to explain it guru.
The diode rings have the advantage that they will work at substantial signal levels, so are often used for frontend receiver mixers, as they are pretty well immune to cross modulation. 1496 are better balanced, and probably better for generating SSB, but not so good for a receiver frontend mixer.
You posted a circuit a while back using just two diodes, and a preset to adjust the balance - have you tried making one like that?.
If it's of any interest?, my long ago receiver used a dual-gate mosfet front end, with delayed AGC applied to the second gate. It was fed from a tuned pre-scaler, with a manual attenuator on the front to prevent overload and crossmod. The mixer was another dual-gate mosfet, and the oscillator used bi-polar transistors. The IF used CA-something or other IC's (they've been mentioned somewhere in these threads, can't remember the number - I've still got a couple left somewhere?), feeding a 1496 product detector. I used a 9MHz crystal filter, with matching upper and lower sideband crystals, I used two separate oscillators, and switched power between them, making the switch non-critical, and outside the screened box.
Like I've mentioned previously, my original intention was to make a transceiver from it, but I never passed my morse test, so never bothered. I've still got the Plessy SL6-something IC I bought for the mike preamp, which did all the processing in a single IC.
Plessy made some great RF and audio application ICs back then but I never found an easy source for them so didn't get to play with them.
They were a UK company, so it was easy over here!
This SSB transceiver seems to use the 1496. Check out his circuit.
https://www.arrl.org/tis/info/pdf/9001028.pdf
Wow! Did you see that 14MHz band pass filter? That thing is pretty hairy.
Plesy specialized in high frequency stuff didn't they?
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