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Help: Audio is pumping on bands 17 and 15.

[email protected] All Messages By This Member #33906 The yellow LED next to the reset button on the Teensy board lights up brightly and dimly. And the audio is pumping most strongly on bands 17 and 15 at the same time. What's the problem? Only the main-board and the RF-board (equipped with a TX only) are connected. Regards, Wolfgang
Oliver KI3P All Messages By This Member #33907 I've not tried testing this particular configuration, so I'm speculating here. If you don't have any receive circuitry populated then the only signal present to be digitized is the self-induced noise on the main board, which comes primarily from the display. Does the noise get lower if you move your main board further away from the display? I don't think this is necessarily a problem, it just reflects an incomplete radio build. On Monday, May 19th, 2025 at 2:52 AM, WF.Fiebig@... <WF.Fiebig@...> wrote: toggle quoted message Show quoted text The yellow LED next to the reset button on the Teensy board lights up brightly and dimly. And the audio is pumping most strongly on bands 17 and 15 at the same time. What's the problem? Only the main-board and the RF-board (equipped with a TX only) are connected. Regards, Wolfgang
bty84827531 All Messages By This Member #33917 I've got the same issue with a completed radio. It does not affect the spectrum display or the S meter, only the audio. It's confined to 17 and 15 metres. The pumping occurs about twice per second. It does not occur if the radio starts up on 17 or 15 metres direct from switch-on but starts as soon as the band is changed to one of these two bands. ? Roger G8JWT
Oliver KI3P All Messages By This Member #33932 Can you please give an exact sequence of steps to reproduce this error, starting with a radio that is turned off. I think I can reconstruct it from your description, but want to be sure. Please also tell me which version of the software you are running. On Monday, May 19th, 2025 at 11:45 AM, bty84827531 via groups.io <roger.trett@...> wrote: toggle quoted message Show quoted text I've got the same issue with a completed radio. It does not affect the spectrum display or the S meter, only the audio. It's confined to 17 and 15 metres. The pumping occurs about twice per second. It does not occur if the radio starts up on 17 or 15 metres direct from switch-on but starts as soon as the band is changed to one of these two bands. ? Roger G8JWT
bty84827531 All Messages By This Member #33937 1) Turn radio on, set band to 20m 2) Turn radio off 3) Turn radio on, note no audio pumping 4) Change band to 17m, note audio pumping starts 5) Change band to 15m, note audio pumping 6) Change band in sequence, note audio pumping stops on all bands except 17m and 15m 7) Return band to 17m. Note audio pumping. 8) Switch off radio 9) Switch on radio. Note that audio pumping is not present. 10) Change band in sequence. Note audio pumping resumes on 17m and 15m but is not present on other bands. ? Roger G8JWT
bty84827531 All Messages By This Member #33938 Sorry, forgot to add that the software is version 66.9.
[email protected] All Messages By This Member #33939 software is version 66.9. Only RF board with RX component installed No BPF or LPF board? installed No SHUTDOWN component installed I can receive stations via RX. ? Turn radio on, set to band 40 No pumping Change band in sequence. Note: Audio pumping starts on 17m and 15m, but is not present on other bands. ? Greetings wolfgang
Oliver KI3P All Messages By This Member #33940 I don't hear any audio artifacts on 17m on my radio and can't make those that I do hear on 15m go away by turning the radio off then on again. Can you record a short audio or video clip of the behavior? On Tuesday, May 20th, 2025 at 4:42 AM, WF.Fiebig@... <WF.Fiebig@...> wrote: toggle quoted message Show quoted text software is version 66.9. Only RF board with RX component installed No BPF or LPF board? installed No SHUTDOWN component installed I can receive stations via RX. ? Turn radio on, set to band 40 No pumping Change band in sequence. Note: Audio pumping starts on 17m and 15m, but is not present on other bands. ? Greetings wolfgang
jerry-KF6VB All Messages By This Member #33946 V12? I'd check U8 on the LPF control card. It got fried on mine, and it caused transmit oscillation on the higher bands. - Jerry, KF6VB toggle quoted message Show quoted text On 2025-05-20 00:52, bty84827531 via groups.io wrote: 1) Turn radio on, set band to 20m 2) Turn radio off 3) Turn radio on, note no audio pumping 4) Change band to 17m, note audio pumping starts 5) Change band to 15m, note audio pumping 6) Change band in sequence, note audio pumping stops on all bands except 17m and 15m 7) Return band to 17m. Note audio pumping. 8) Switch off radio 9) Switch on radio. Note that audio pumping is not present. 10) Change band in sequence. Note audio pumping resumes on 17m and 15m but is not present on other bands. Roger G8JWT Links: ------ [1] /g/SoftwareControlledHamRadio/message/33937 [2] /mt/113187923/243852 [3] /g/SoftwareControlledHamRadio/post [4] /g/SoftwareControlledHamRadio/editsub/243852 [5] /g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
bty84827531 All Messages By This Member #33949 Oliver, here's a recording of my T41 on 17m being driven by a carrier from a signal generator. ? Roger G8JWT New Recording 5.m4a New Recording 5.m4a
jjpurdum Member Profile All Messages By This Member #33950 That almost sounds like the keyer is on. Jack, W8TEE On Tuesday, May 20, 2025 at 12:51:10 PM EDT, bty84827531 via groups.io <roger.trett@...> wrote: Oliver, here's a recording of my T41 on 17m being driven by a carrier from a signal generator. ? Roger G8JWT -- Jack, W8TEE

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