Date
1 - 5 of 5
It appears that FST4W HF bands can't be shared with WSPR
|
Rob Robinett
It should have been obvious to me why the 160M FST4W band is 200 Hz higher in WSJT-x ;=(
HF band FST4W experiments I have been running with Stu WB6YRW strongly suggest that FST4W signals should not be mixed in the same 200 Hz band with WSPR signals: the WSPR signals look like noise to the FST4W decoder. So I'm going to disable attempts to decode 4W on 80M and above which I added at BFK and other sites. With that change, almost all sites will have enough CPU and disk to handle the full WSPR bands + 2200/630 FST4W as it is currently implemented. Unfortunately WD 3.0.3 searches for FST4W in the same 200 Hz band as WSPR and only N3AGE has been transmitting there, so I'll disable 160M FST4W as well. I'll post questions about the 80-10M 4W bands to the WSJT-x forum with a goal of defining all of them to follow the 160M model of being 200 Hz above WSPR. If that band allocation is agreed upon, it will take some help from Gwynn and some SW development for me to add such support to WD 3.0.3 |
|
|
|
Rob,
toggle quoted message
Show quoted text
I think those long decode modes are only really useful for the LF bands anyway. Even the best antenna systems on 630 and 2200 are really inefficient, so the long transmission time allows signals that would never be heard otherwise. Steve KD2OM . On Jun 26, 2022, at 17:56, Rob Robinett <rob@...> wrote:
|
|
|
|
Glenn Elmore
I think they may be useful sometimes on UHF and microwave as well. My previous experiments with 15 minute WSPR frames on 70cm and 23 cm were really promising. It takes good frequency control but some paths at these wavelengths are very stable and another 10 dB of signal could be really interesting.
toggle quoted message
Show quoted text
Glenn n6gn On 6/26/22 16:19, KD2OM wrote:
I think those long decode modes are only really useful for the LF bands anyway. Even the best antenna systems on 630 and 2200 are really inefficient, so the long transmission time allows signals that would never be heard otherwise. |
|
|
|
Stuart Ogawa
rob,
just for clarity sake, you want me to full stop fts4w transmissions for now, correct? -stu |
|
|
|
Rob Robinett
Hi Stu, In response to Glenn's comment, I've changed my mind. I think that 4W ought to be able to coexist with WSPR, although if there is a WSPR signal on or near the FST4W signal, the jt9 decoder won't be able to deconvolute out the WSPR signal which will look like noise to jt9. So I think there is a good argument for moving FST4W signals out of the WSPR band, but for the purpose of our experiments doing that is probably not necessary as long you set to FST4W tx frequency out of the 1500+-10 Hz range which is crowded with WSPRers who leave the WSJT-x at its default 1550 frequency. Rob On Sun, Jun 26, 2022 at 4:26 PM <stuartogawa@...> wrote: rob, --
|
|
|