So, if you are a contester or just plain operate only, time to zone out because today I want to cover a steerable 4.9152 MHz IF module. So, this post translates to Techie Talk.
Bored? As an alternative you could try to locate the Ham Radio Chick's You Tube channel, where she will update you on her latest POTA adventures following her 8-day sprint to an Extra Class License.
The reason for covering this module again is because in less than 10 square inches you have a powerful piece of technology to wit:
Transmit and Receive mixer (SBL-1)
1st IF AMP using J310's as a DGM
Homebrew 4.9152 MHz 4 Pole Crystal Filter
2nd IF Amp using J310's as a DGM
Product Detector/Balance Modulator (ADE-1)
Audio Filter on the Out/In of the PD/BM
Ride along 4.9152 MHz BFO
The DGM Amps have trim pots to balance the input and output signals to achieve low distortion and good signal and noise handling.
The 1st IF Amp is a Tuned Amp and the 2nd IF Amp is broad band (No this is not Ina Rae Hutton's all girl band). The signal path through the 1st and 2nd IF Amps is always in the same direction and two small on-board relays steer the IF Module input to either the SBL-1 or ADE-1 depending on whether in Receive or Transmit. (Something 1st seen in the EAQRP Club "Pilgrim" radio.)
This was an earlier You Tube Video of this rig. Yes, it had some warts, but the plan is to fix those hiccups. That is a fun aspect of the hobby for me.
Yes, there are few I can hardly hear you, but you are 5X9 comments to be heard while you build stuff. So, if you need an hourly dose of 5X9 Park 160079... that does happen during rig fabrication.
Also needed for a complete rig is a digital LO, a display, a steerable (Rx and Tx) RF Amp, a Band Pass Filter. Low Pass Filter and TR. Not mentioned as yet the Transmit Driver and Final Amp.
Them that know, now don't care if you know.
73's
Pete N6QW
