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Icom IC-706mkiig IF-SDR [message #3032] Mon, 10 March 2014 02:07
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Registered: December 2004
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Next video will be a IC706 with TV dongle connected to the IF, it works very well.

Well here's part two for what it's worth.


It's quite easy to pick up the 69MHz intermediate frequency in an Icom 706 mk1. There are two plated holes in the track which carry the IF signal so just by inserting the inner of the coax into one of these it can be picked up by the dongle.

http://youtu.be/vY8xlmuX21s

The TV dongle accepts this signal and if it is then tuned to 69MHz you are then able to see the IF on the spectrum display and waterfall. The waterfall is not shown here . With the dongle I have here I am able 1.8MHz of spectrum but I can also zoom-in. There are lots of features in the software most impressive is the filtering.

Software used here is SDR#, another that works with the dongle is HDSDR.

So why would you do this? Well it adds a whole new dimension to an otherwise boring black box.

Try it and find out.

There is no reason, of course, why this set-up can not be applied to other rigs with an IF over 60MHz (dongle doesn't go lower).

Hope you find this of interest.

Sorry video's not up to much.

If you want more info ask me at the Club.

Next will be Powersdr-IF and CAT control of the IC706.



SDR-IF Part Three

I think that this set-up is the most likely to appeal to members.

Here I am using my IC 706 Mk1, the intermediate frequency of which is feed to a home-brewed SDR which I mostly use on Six and Four Meters, so it's ideal to receive the 69MHz IF from the 706.



The software in use here is Ham Radio Deluxe, PowerSDR-IF and Rocky.

HRD is used for the CAT control of the 706. PowerSDR-IF then connects to HRD.

http://youtu.be/0SI2rggbiFI

The waterfall display of Rocky is used to view CW, it is not connected to the 706 or the other software, using the sound card output only.

In the video I'm just tuning around the bands mostly using the mouse to click on the spectrum display/pan-adapter of PowerSDR-IF but also using both the slider and DX-spots of HRD. Of course it's also possible to use the 706 tuning knob but this seems a bit "old hat".

The pan-adapter reveals some pretty wide signals, some very clean ones, some with poor carrier suppression, sweepers, odd QRM sources and more. There is no CW filter in the 706 so the SDR output is the only way to receive CW properly.

Hope this is of interest.

If you want more info ask me at the club or post here.



I have been asked by a Club member for information on the 1st IF tap point that I used to feed the
RTL TV dongle from my IC706 Mk1.
The photos below should help.



"It's quite easy to pick up the 69MHz intermediate frequency in an Icom 706 mk1. There are two plated holes in the track which carry the IF signal so just by inserting the inner of the coax into one of these it can be picked up by the dongle."

http://www.hamradio.cc/images/forum/mods/icom_706_mkiig_if_sdr.jpg

Use the hole towards the front panel. BE CAREFUL AND TRY IT BEFORE SOLDERING.

http://www.hamradio.cc/images/forum/mods/icom_706_mkiig_if_sdr_.jpg

Daniel Fourlas - sv1jcz
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