Archives for: March 2008, 06

Using The DSP On the Kenwood TS-2000 To Isolate PSK Signals

03/06/08 | by admin [mail] | Categories: Ham Radio AI1P

If you would like to eliminate all but one digital signal on your TS2k while operating in sideband mode you will find that it can be done in a round-about way. I discovered this on a TS-2000 forum but I can’t recall where so I’m putting it down here before I forget.

1. Switch the receive to CW mode. This enables the use of the very narrow filters down to 50hz.
2. Tune to your signal into the 300-800hz range on the waterfall. Look for signals about 800hz above where you usually would in USB mode.
3. Turn on XIT (transmit incremental tuning) and adjust it to -800 which is the difference between the CW tuning and the USB tuning
4. Press A=B and turn on split
5. Hold down the TF-SET button (this reverses the split) and hit USB while it’s flipped. Release the TF-SET button and your receive should still say CW while your transmit will be in USB.

Your rig will now transmit on the appropriate USB frequency (use TF-SET to ensure signals come in on the same spot on the waterfall) and receive through the filters only available in CW mode. You can use the filters by adjusting the WIDTH and SHIFT knobs, their functions will quickly be obvious if you’re watching your waterfall.

Of course if you change the radio’s frequency at any point you will have to do steps 4-5 again to ensure your transmit frequency matches the receive.

It would be nice to just have this as a “mode” on the rig but we can’t have everything can we.

UPDATE

There’s a better way to do it. I discovered menu number 37 “SSB-TO-CW CHANGE” which will change the frequency shift automatically for you. This also permits you to store the correct split/mode in memory (memory will not save the XIT status). Set menu 37 to ‘ON’ and then use it as follows:

1) Set the VFO to B (A/B) in USB mode
2) Find the frequency you want and tune in a signal to the lower half of the waterfall.
3) Set A=B
4) Hold down TF-SET and hit CW to set the receive mode to CW. You will see the frequency change and the signals will match the USB on the waterfall again.
5) Set the VFO to A (A/B) and you’re ready to go.

At this point you can store the split in memory to make it easy to come back to these settings without further tweaking.

To change overall frequency, do steps 1-5 again.

Matthew Steven's Thought Box

Matthew Steven is a lifelong technology enthusiast. He has been in the business of creating ecommerce web applications, solving problems on UNIX platforms, and hosting servers since the earliest days of the internet. He is active in community service, plays classical guitar, and has a number of furry children.

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