What does fldigi 4.2.06 send when T/R is toggled?
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If TXID (and RXID, I suppose, though it shouldn't have an effect) is turned off, and I toggle T/R, I see fldigi TX something at the beginning and the end. I don't have anything in the TX pane to send.
It seems to send something, then a bunch of nothing (expected, because there is naught to send), then when I toggle T/R off, fldigi sends another brief "something". 73 Rich NE1EE The Dusty Key On the banks of the Piscataqua |
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What 鈥渕ode鈥� are you using when you see this?
听
I think all Thor modes do send a string of characters 听to 鈥渃lear the buffer鈥�
I hear it go fom low to high pitch tones like a trombone.
听
Go to Psk31 and see if you still notice tones at the start and end
听
Olivia also sends a string at the start of an Olivia mode from the lowest pitch tone to the highest pitch tone,
which sounds like 鈥渂oo-beep鈥� twice
听
de k3eui
barry
Philly
听
听 |
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Good morn (here On the banks of the Piscataqua, anyway ;-)
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Thanks for the reply. Tobias earlier reported in a different thread on a related subject: "Your wav file signal looks exactly as expected: a leading short (1 second) center frequency tune tone, followed by the (non-)message consisting of the (idle) dual-tone pair of BPSK125 and then the trailing short (1 second) center frequency tune tone again." So I now understand what fldigi sends when it is idle...and the idle audio will vary with the modem in use. Sounds like the leading and trailing (1 second) center frequency tune tone is also default. Not sure why the trailing tone, but perhaps to make sure that PTT is not dropped too soon. Those leading, trailing 1 s tones are not a burden. This all came about because I decided to test my hardware in a way I had not previously, and was surprised by the results. I now see that everything is operating just FB. 73 Rich NE1EE The Dusty Key On the banks of the Piscataqua On 2025-04-01 06:28:, K3EUI Barry via groups.io wrote:
What 搈ode� are you using when you see this? |
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GM, Tobias,
Locally, when we start a digi net, NC sends a Tune. 1. This allows RX stations to adjust their radio+hardware sound card+CODEC+fldigi so that they have a clean sig in the SIG panel. I prefer to do this Tune at ~512 Hz, because the SIG panel has no time controls, and a 500 Hz tone is the best we can do for horizontal viewing. Many prefer 1000 or 1500 Hz, but it is much more difficult to see incoming signal distortion at those frequencies. I have asked in the past to have a much shorter time (wave more spread out) in the SIG display, but has not happened yet. There may be a reason for this, but I havna heard. Even if we don't have a time adjustment, we could really benefit from swapping to a time that is much shorter than the current SIG trace, and then swap back to the current one if that is of use to some. 2. NC can then ask a competent station to report its Tune signal quality. The signal can be perfectly clean in the fldigi display, but by the time it hits the air waves it can be distorted. There are many different individual brand-model signal processes. For example, the Kenwood V71 massages data signals to put them in a p-p window that the amp can handle. The Kenwood F6 HT can easily clip a too-high p-p audio signal. fldigi is pretty robust when it comes to signal processing (see FFTs), but it still pays to have the cleanest signal possible. So a competent station operator, with a properly adjusted audio stream, can look at the NC signal and report its quality. All this is the matter of a few minutes, so not a big burden. 3. Should a station need to send to NC, it can likewise use Tune to verify good signal quality, potentially saving the time to retransmit. 73 Rich NE1EE The Dusty Key On the banks of the Piscataqua |
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Hello Rich, Sounds like a great system to have all stations on the same page,so to speak. For comparison, we had our weekly DL0BS QTC here in Bavaria last night, as every Monday evening from 1900 UTC centered around 3590.75 kHz 80 m. As an SWL, I am just listening but supply a QTC and signal report over time by e-mail to interested participants. The DigiMode has been MFSK32 for about 1.5 years now and all get along quite well without extra tuning assistance, despite the classic MFSK modes being quite sensitive against any offset beyond a few Hz. Most stations use RSID and it works just fine this way. The mode is faster than most people can type, so things run quite swiftly. QRP or remote stations may use MFSK16 instead, like W1AW does for their QST bulletins. I attach my signal chart just for the qsl traffic, to give you an idea. The vertical scale is in Hz, offset from my rx tuned QRG of 3588.0 kHz. This time, the center frequency was 0.2 kHz low for whatever reason, but everyone adapted to it without any hickups... All the best and 73s Tobias .-.-. Am Dienstag, 1. April 2025 um 14:48:21 MESZ hat Rich NE1EE via groups.io <thedustykey@...> Folgendes geschrieben: GM, Tobias, Locally, when we start a digi net, NC sends a Tune. 1. This allows RX stations to adjust their radio+hardware sound card+CODEC+fldigi so that they have a clean sig in the SIG panel. I prefer to do this Tune at ~512 Hz, because the SIG panel has no time controls, and a 500 Hz tone is the best we can do for horizontal viewing. Many prefer 1000 or 1500 Hz, but it is much more difficult to see incoming signal distortion at those frequencies. I have asked in the past to have a much shorter time (wave more spread out) in the SIG display, but has not happened yet. There may be a reason for this, but I havna heard. Even if we don't have a time adjustment, we could really benefit from swapping to a time that is much shorter than the current SIG trace, and then swap back to the current one if that is of use to some. 2. NC can then ask a competent station to report its Tune signal quality. The signal can be perfectly clean in the fldigi display, but by the time it hits the air waves it can be distorted. There are many different individual brand-model signal processes. For example, the Kenwood V71 massages data signals to put them in a p-p window that the amp can handle. The Kenwood F6 HT can easily clip a too-high p-p audio signal. fldigi is pretty robust when it comes to signal processing (see FFTs), but it still pays to have the cleanest signal possible. So a competent station operator, with a properly adjusted audio stream, can look at the NC signal and report its quality. All this is the matter of a few minutes, so not a big burden. 3. Should a station need to send to NC, it can likewise use Tune to verify good signal quality, potentially saving the time to retransmit. 73 Rich NE1EE The Dusty Key On the banks of the Piscataqua |
Rich NE1EE
K3EUI Barry
