Wednesday, March 03, 2010

HF radio - Balanced modulator + SSB IF filter


The schematic from the balanced modulator and crystal filter pre-amp are correct, just finished to place the boards in the radio and made a quick test, still need to check BFO frequency and align the impedance match on the filter.



Here's the video transmitting on 9Mhz USB (9Mhz + 1.5 Khz, more Khz minus Khz):

video

The boards in place:









And the current status of the front panel, the tree pot's on the lower line without buttons are from left to right: mic gain, tx gain and reception AGC (slow, fast, manual):

2 comments:

البرجوازي العراقي said...

Thanks for making a specific blog about SSB!

What do you prefer
Superhet or Direct Conversion?

This is my blog... I try to collect many methods of Radio receiving and analyze them! I like to know how it works.

http://radiobuilder.blogspot.com

Ricardo - CT2GQV said...

Hello,

I just try to give something back with my blog....

I do prefer superhet but any superhet end's up in some sort of direct conversion at the IF part...

Checked your blog, nice. Keep up!

I do try to understand always a little bit of what I am building but the more you learn the more you know how little your knowledge is.

73 de Ricardo - CT2GQV