Operating split T / R on HF SSB

Discussion in 'Working Different Modes' started by KA9JLM, Apr 8, 2012.

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  1. KA9JLM

    KA9JLM Ham Member QRZ Page

    What is the purpose for Operating split T / R on 20 meters SSB ?

    I thought it was always best to listen on your transmit frequency before you start transmitting.

    Why would you need to operate on a split ?

    What am I missing ?

  2. KC5FM

    KC5FM Ham Member QRZ Page

    You are missing DX operators who transmit in the part of the band that they are allowed to use. We are often not allowed to use that segment.

    Therefore, they call CQ and listen up in the part of the band where we can transmit.

    Hope that helps.

  3. K7JBQ

    K7JBQ Moderator Volunteer Moderator QRZ Page

    Even if both the DX and those calling are authorized to use the same frequencies, rare or semi-rare DX will listen on a different frequency than they are sending. This is a good thing, as it spreads out the pileup and lets us hear the DX instead of the guy down the block transmitting on his frequency.

  4. KO6WB

    KO6WB Premium Subscriber QRZ Page

    Just did my first split operation by working E51M on 40 meter SSB. The band was totally unoccupied and I don't know why they wanted to work split. It was only a 5Khz split. There was no pile-up but since the band was empty it didn't hurt to run split. The latter operations that I heard from E51M were not split.
    Splits to me are a waste of spectrum. It requires twice as much and if there is a pile-up then it will really spread out and cover a hugh chunk of spectrum.
  5. K9STH

    K9STH Ham Member QRZ Page


    Obviously, you have not worked a lot of DX or contests!

    On 40-meters, it is very common for a DX station to operate below 7125 kHz and call out frequencies above 7125 where he/she has a relatively clear frequency on which to listen. Until Region I and Region III got the 7100 kHz to 7200 kHz segment the only way that stations in the contiguous 48 states could work SSB was to operate split since those stations could not transmit anywhere in the segment allocated to the contiguous 48 states. Alaska and Hawai'i, as well as those stations licensed by the FCC, can operate in the 7025 kHz to 7100 kHz segment.

    Glen, K9STH
  6. KA9JLM

    KA9JLM Ham Member QRZ Page

    I do not do contesting.

    It just seems strange to just be a number, for some Log Book.

    I though AM with DSB was used for clearing a frequency. lol
  7. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Operating split, they are doing a favor to "us" who are calling them.

    By using split frequencies, it allows us to hear them better when they answer somebody because the "pileup" will be on a different frequency, and not theirs.

    If managed well, it's very efficient and allows more of "us" to work "them."
  8. KA9JLM

    KA9JLM Ham Member QRZ Page

    The space shuttle used simplex when I helped amateur radio get in to flight.

    If you missed the pass, you had to wait for another rev.

    That worked just fine.

    Split frequencies were made for repeaters.

    Not Broadcast stations.
  9. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Hams don't broadcast.

    And when I worked Owen Garriot's (W5LFL's) first pass where he could use ham radio from the Shuttle (1983?), he was operating split on 2m FM (not a repeater, just two different simplex frequencies). He may have started out on simplex, but by the next day he was operating split. I was so anxious to make the contact, which was midday, I took a long lunch and parked on a clear hilltop with a long horizon, and tied my 2m FM whip antenna over with a string to make it mostly horizontal -- which definitely worked better than vertical. Got through on about the fourth or fifth call.
  10. K9STH

    K9STH Ham Member QRZ Page


    Whether or not you work contests, there are a LOT of operators who do so just to get new countries for DXCC, WAZ, etc., and not to actually "win" the competition. Whether or not you work DX, there are a LOT of operators who do. Now, it is harder with a General Class license rather than an Advanced Class or Amateur Extra Class license to work DX although I have a friend, who just has a General Class license, that is at the top of the DXCC Honor Roll having worked every DXCC country that now make up the DXCC country list.

    For those with General Class licenses, if the DX station does work "split" on SSB, it is MUCH easier for those operators to work the DX. There is nothing written which says that you have to work stations operating "split", there is nothing written which says that you even have to work any specific station, DX or stateside. But, if you are interested in working DX then, at some time, will have to work stations using "split" if you want to increase your number of countries worked.

    As WIK points out, when a DX station operates "split", it is MUCH easier to both copy the DX station and to work the DX station because the DX station is basically on a "clear" frequency and those stations calling the DX station are generally "spread out". That makes it much easier for the stations calling the DX to work the station.

    Even on CW, when a DX station works "split" it is MUCH easier to work that station because of the very same reasons that are listed above. In contests, on CW, operating "split" is not done for a number of reasons.

    Of course, you are always entitled to express your opinion. However, there are a LOT of operators who are going to disagree with you.

    Glen, K9STH
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