Omni VII - Procedure to Split VFO's With Different Band Widths

The following are instructions for the model 588 (OMNI VII) to split VFOs with different Band Widths i.e. narrow BW for the DX and wide BW for searching the pile for "who is working him now".

I have come up with an alternative which seems to work for CW pileups. I use a different band stack register for split operation. Put VFO A on the DX freq, Mode set to USB, IF 500, BW 350 (or any narrow combination); set A=B; Split; A/B, tune B VFO to the pileup freq; set mode UCW; set BW to 1200, IF to 2.5k.

With this configuration you can push the A/B button to toggle between listening to the DX (VFO A) with narrow BW and the pile (VFO B) with wide BW. An advantage to this configuration is that since the VFO on the DX QRG is in USB, it will NOT transmit on the DX's freq if you are using a standard keyer although those using AFSK to send CW via SSB can still QRM the DX.

I have come up with another alternative which seems to work for SSB pileups. I use a different band stack register for split operation. Put VFO A on the DX freq, Mode set to U/LCW, IF 2.5k, BW 2400 (or any wide combination); set A=B; Split; A/B, tune B VFO to the pileup freq; set mode U/LSB; set BW to 2600, IF to 6k or any comfortable listening width.

With this configuration you can push the A/B button to toggle between listening to the DX (VFO A) with narrow BW and the pile (VFO B) with wide BW. An advantage to this configuration is that since the VFO on the DX QRG is in CW, it will NOT transmit SSB on the DX's freq.

While setting wide and narrow Band Width / mode splits for pile-up busting, I discovered its easier than I previously posted. You do NOT need to use different band registers for CW and SSB Dxing.

I use the "D" register for each band. Set the frequency inside the band. Push "A=B"; push "SPL"; Push "Mode" then the correct SSB for the band (LSB 160, 80, 40; USB 20, 15, 10). Set the BW to 500.

Push "A/B"; Push "Mode" then the CW mode corresponding to the SSB set above (to keep the signal with the same pass band relationship) LCW for LSB or UCW for SSB; Set the BW to 2400.

Do the above procedure for each band. Once set up, it’s just a matter of going to the desired band and the "split" register (D in my case) and the cross mode BW splits are configured.

For CW DX, push the "A/B" until the Mode is USB or LSB, tune to the DX, set the BW to a comfortable narrow value, push "A/B"; UCW or LCW is displayed, tune to the pile, set the BW to a wide value. Push "A/B" to RX on the DX / TX in the pile or Push "A/B" to listen to the pile and NOT transmit on the DX.

For SSB DX, push the "A/B" until the Mode is UCW or LCW, tune to the DX, set the BW to a comfortable narrow value, push "A/B"; USB or LSB is displayed, tune to the pile, set the BW to a wide value. Push "A/B" to RX on the DX / TX in the pile or Push "A/B" to listen to the pile and NOT transmit on the DX.

CSM(retired) Gary Huber - AB9M
9679 Heron Bay Rd
Bloomington, IL 61705
(309-662-0604)
www.csm-gh.com
glhuber@msn.com
gary.huber@us.army.mil


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