4905Re: FT1000 MK5 Field / Icom radio IF panadapter.
- Jun 1, 2006Hi Lyle,
good news because i also own a IC-706.
some questions :
- do you feed the SDR by mean of empty filter slot input line ?
- or is the SDR input in parallel with the used filter ?
- did you notice injected noise to 706 RXed signal when using SDR
I have to take a look to 706 schematic to see if the radio disable
the feeding of unselected IF filter slot.
I was thinking to use a Jfet amplifier as buffer / decoupler,
About th 25 KHz panning, they are not so much but better than
Many Thanks, Marco.
--- In email@example.com, "Lyle Koehler, K0LR" <k0lr@...>
> On my original IC-706, I was able to tap into the circuit at the
> to the 9 MHz filter. Since it appears to be a fairly low-impedancegeneral-
> point, I simply coupled the signal through a 50 pF capacitor and
> brought out a short piece of RG-174 coax with an inline RCA phono
> connector. There is a ceramic roofing filter in the first IF at 69
> MHz. The service manual doesn't provide any information on the
> bandwidth, but it appears to be about 25 kHz. With my homebrew
> coverage SDR receiver set so that the center frequency comes outat 12
> kHz, the panadapter provides a +/- 12 kHz display. I noticed thatwith
> a fixed signal coming in, the output frequency jumps arounddepending
> on what mode you're using. Not a surprise, but it probably screwsup
> the centering of the panadapter display if you want to use it incould
> multiple modes.
> The output level on the 706 IF is not excessive; if anything, it
> use a little more gain going into the SD receiver.
> Lyle, K0LR
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