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ALC is max out with ic705 using fldigi
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Mike Howard
Hi,
Not sure how to get the ALC lowered with my ic705. It is pegged out when I transmit during PSK31. Have output power set to 5 watts. Also any suggestions on how to properly setup the ic 705 with FLDigi in the radio. Thank-you Mike/WA0SPG |
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Cliff
Mike,
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Set the rig’s power to 100% and reduce the audio drive to get the 5 watts you want. I suspect the way you’re doing it you limit the power out, but you’re probably blasting the input to the modulator. Use the fldigi transmit attenuator below the waterfall and the windows mixer to set the audio level.
73,
Cliff, AE5ZA
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Mike If you are using Windows go to your speaker/audio codec and reduce the volume until the ALC is in the middle during transmit. I don’t have a 705 but for FLDigi on the 7300 go to rig configuration and select what ever you are using in WSJTX (Hamlib/ flrig etc) and under sound card/device select the same usb audio codec that is working for WSJTX. Hope that helps. Joel AC8WS On Dec 5, 2020, at 6:11 PM, Mike Howard <mhowardems@...> wrote:
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Cliff
Joel,
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FYI, if you want a really clean signal when using PSK31 the ALC needs to be zero. It is very sensitive to non-linearity. Some of the other modes are not quite so sensitive, but it’s always safe to be at zero ALC.
73,
Cliff, AE5ZA
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Cliff Thanks! I’ll give it a try. Joel AC8WS On Dec 5, 2020, at 9:49 PM, Cliff <ae5zaham@...> wrote:
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Michael Black
A friend of mine and I wrote a paper used by 100's of operators now to set audio levels for digital modes. Covers all rigs known to us so far. Mike
On Saturday, December 5, 2020, 09:21:01 PM CST, Joel <styx@...> wrote:
Cliff Thanks! I’ll give it a try. Joel AC8WS On Dec 5, 2020, at 9:49 PM, Cliff <ae5zaham@...> wrote:
Joel, FYI, if you want a really clean signal when using PSK31 the ALC needs to be zero. It is very sensitive to non-linearity. Some of the other modes are not quite so sensitive, but it’s always safe to be at zero ALC. Mike If you are using Windows go to your speaker/audio codec and reduce the volume until the ALC is in the middle during transmit. I don’t have a 705 but for FLDigi on the 7300 go to rig configuration and select what ever you are using in WSJTX (Hamlib/ flrig etc) and under sound card/device select the same usb audio codec that is working for WSJTX. Hope that helps. Joel AC8WS On Dec 5, 2020, at 6:11 PM, Mike Howard <mhowardems@...> wrote:
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Some transceivers always show
a small amount of ALC. This is true of my IC-7100 and it might
be true for the IC-705. My principal fldigi/flrig/IC-705 tester
is Harry, W3YJ. You can find him on the linuxham@groups.io
support group.
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David On 12/5/20 9:20 PM, Joel wrote:
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In the Icoms with internal USB sound chip, the input is way too hot at the default "USB MOD Level" setting of 50%. Turn it down to ~15-20%, then you'll have better adjustable range on the computer output at ~20-30%.
73, --kv5r |
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