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Locked Calling the DX on his transmit frequency #QSO_practices
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I used to have a notch filter to mask out the harmonics from my solar panel inverter. It didn’t seem worth the effort in the end. This was with a Flex-1500. I’ve not even tried to use it with the IC-7300.
73 Phil GM3ZZA Sent from Mail for Windows From: neil_zampella Sent: 04 September 2022 18:50 To: main@WSJTX.groups.io Subject: Re: [WSJTX] Calling the DX on his transmit frequency #QSO_practices Yes some people do, and no it doesn't unless they're trying to eliminate a very 'loud' or 'powerful' signal nearby causing issues. The program is designed to receive the entire bandwidth, notching out sections messes up the SNR calculations, and can miss people replying to CQs on other areas of that bandwidth. Neil, KN3ILZ On 9/4/2022 11:04 AM, Todd Little wrote: Hi Sam, -- 73 Phil GM3ZZA |
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Reino Talarmo
A notch helps, if the local interfering signal is really strong. It may help to decode a weak signal, if you need to turn RF gain too much down before signal no more overloads A/D-conversion. On the other hand RF gain that keeps thermometer at 80 dB may be enough.
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73, Reino -----Original Message-----
From: main@WSJTX.groups.io [mailto:main@WSJTX.groups.io] On Behalf Of Chuck Gelm Sent: 4. syyskuutata 2022 21:16 To: main@WSJTX.groups.io Subject: Re: [WSJTX] Calling the DX on his transmit frequency #QSO_practices On 9/4/22 12:04, Todd Little wrote: Hi Sam,I never have and do not know how it would help. ? Faster decodes because it omits a frequency range? |
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Chuck Gelm
On 9/4/22 12:04, Todd Little wrote:
Hi Sam,I never have and do not know how it would help. ? Faster decodes because it omits a frequency range? |
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neil_zampella <neilz@...>
Yes some people do, and no it doesn't unless they're trying to eliminate
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a very 'loud' or 'powerful' signal nearby causing issues. The program is designed to receive the entire bandwidth, notching out sections messes up the SNR calculations, and can miss people replying to CQs on other areas of that bandwidth. Neil, KN3ILZ On 9/4/2022 11:04 AM, Todd Little wrote:
Hi Sam, |
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Todd Little
Hi Sam,
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Do people use a notch filter with FT8? And if so, how does it help? 73, Todd, N9MWB -----Original Message----- |
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Reino Talarmo
PS Is WSJT-X when I try to call on the remote stations transmit offset, unless the remote station answers my call, the Enable TX goes off. Maybe it's just a setting. Still learning.Hi Todd, That feature is by design. It is minimizing QRM on DX station frequency. It is assumed that the station to whom DX answered on the DX station frequency, it may be a wrong assumption, but still the best one. 73, Reino OH3mA |
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Sam Birnbaum
Hi Todd,
As well the DX might not even be listening on the offset their calling on.Unless the CQers have a Notch on their tx offset, they are listening on the entire bandpass. they may choose to ignore, but they are still listening 73, Sam W2JDB -----Original Message----- From: Todd Little <toddjlittle@...> To: main@WSJTX.groups.io Sent: Sat, Sep 3, 2022 1:55 pm Subject: Re: [WSJTX] Calling the DX on his transmit frequency #QSO_practices Why does it matter what offset anyone uses? As well the DX might not even be listening on the offset their calling on. Unless the band is extremely crowded, spreading out the callers seems to make more sense, i.e., calling offset their transmit frequency. What good does piling a bunch of callers on a single offset? 73, Todd, N9MWB PS Is WSJT-X when I try to call on the remote stations transmit offset, unless the remote station answers my call, the Enable TX goes off. Maybe it's just a setting. Still learning. -----Original Message----- |
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Todd Little
Why does it matter what offset anyone uses? As well the DX might not even be listening on the offset their calling on. Unless the band is extremely crowded, spreading out the callers seems to make more sense, i.e., calling offset their transmit frequency. What good does piling a bunch of callers on a single offset?
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73, Todd, N9MWB PS Is WSJT-X when I try to call on the remote stations transmit offset, unless the remote station answers my call, the Enable TX goes off. Maybe it's just a setting. Still learning. -----Original Message----- |
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Of course with the FT bands as busy as they are these days it is likely that there are other ops that you can't hear operating on the DX's non-TX slot.
73 -Jim NU0C On Fri, 02 Sep 2022 21:43:35 -0700 "Randy, WS4C" <Randy@...> wrote: On Tue, Aug 30, 2022 at 08:48 PM, <careyfisher@...> wrote:I'm not sure you got his point. If NOBODY transmits on the DX's calling frequency during his listening period, then there's a little chunk of spectrum/time going unused. The people who don't call there call somewhere else, using a chunk of spectrum that wouldn't be used if they called on the DX's frequency. |
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Randy, WS4C
On Tue, Aug 30, 2022 at 08:48 PM, <careyfisher@...> wrote:
I'm not sure you got his point. If NOBODY transmits on the DX's calling frequency during his listening period, then there's a little chunk of spectrum/time going unused. The people who don't call there call somewhere else, using a chunk of spectrum that wouldn't be used if they called on the DX's frequency. The one way it would seem to me not to matter is if we assume that some other station would be transmitting on the DX's offset on his opposite cycles rather than using another piece of spectrum elsewhere. In that case, it seems like you'd be right: neither approach would conserve more spectrum, unless maybe you factor in that several stations calling the DX that would be use a chunk each if they all called split would combine in one chunk if they call on the DX's offset. That might conserve some spectrum, but it might also make for more failed decodes that might offset the more efficient use of spectrum. At least this is how it seems to me. Randy, WS4C |
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careyfisher@...
"working a QSO on the same frequency in opposite slots conserves spectrum."
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Nope - opposite timing. It doesn't matter. 73, Carey, WB4HXE On Tue, Aug 30, 2022 at 7:49 PM Timothy Brannon <timbmd@...> wrote:
I've been chasing some DX today and I've noticed several stations calling-- Carey Fisher careyfisher@... --
73, Carey, WB4HXE |
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Darl DEEDS
It’s best practice to transmit on a clear frequency other then his. BUT a caveat, if he insists on doing it all on his frequency then go with the flow as they say. To many people are getting uptight on this “have to transmit separately” do it on a separate frequency if you can but he is the DX so go where he wants or is.
73 NA8W From: Timothy Brannon<mailto:timbmd@...> Sent: Tuesday, August 30, 2022 19:49 To: main@WSJTX.groups.io<mailto:main@WSJTX.groups.io> Subject: [WSJTX] Calling the DX on his transmit frequency #QSO_practices I've been chasing some DX today and I've noticed several stations calling the DX station on his own transmit frequency. Right now, I am watching D2UY Angola: he is consistently transmitting on the 15/45 slots. But there are callers on his waterfall frequency of 203 Hz on the 00/30 slots. I understand that the callers should not interfere on the opposite slot, but for FT8/FT4 isn't it still considered best practice to work split-frequency? Or, am I just old-fashioned and stuck in CW mode? Out of habit I always work split, even for domestic contacts. However, I can understand the argument that FT8/FT4 is different due to the strict timing, and so working a QSO on the same frequency in opposite slots conserves spectrum. What is considered best practice today? 73 de Tim, WA5MD in Dallas |
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I've been chasing some DX today and I've noticed several stations calling the DX station on his own transmit frequency.
Right now, I am watching D2UY Angola: he is consistently transmitting on the 15/45 slots. But there are callers on his waterfall frequency of 203 Hz on the 00/30 slots. I understand that the callers should not interfere on the opposite slot, but for FT8/FT4 isn't it still considered best practice to work split-frequency? Or, am I just old-fashioned and stuck in CW mode? Out of habit I always work split, even for domestic contacts. However, I can understand the argument that FT8/FT4 is different due to the strict timing, and so working a QSO on the same frequency in opposite slots conserves spectrum. What is considered best practice today? 73 de Tim, WA5MD in Dallas |
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