fldigi waterfall offset when using Icom IC-7610 in RTTY mode
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OK, this has me stumped. ? I'm looking to change fldigi from using AFSK to FSK for RTTY with my Icom IC-7610.? Everything has been configured to work fine using AFSK. ? While I'm still working on the FSK transmit connection using WinKeyer USB, I have a question about the waterfall display when receiving audio in RTTY mode on the IC-7610.? Instead of the display being centered at the 1500 KHz mark, it is offset almost 750 Hz up.? This is quite obvious when the 500 KHz filter is enabled on the Icom IC-7610 in RTTY mode.? Please see the attached (note there was no signal present on the frequency when this was taken). ? What do I need to set to center the display like when I'm using AFSK? ? Larry KS9J ? |
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OK, a clue...and I may have figured it out.
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When I change modes on the Icom IC-7610 from LSB-D1 to RTTY, fldigi does not change from LSB-D to RTTY. ?It does reflect changes in the Icom IC-7610 filter though. ?If I change modes in fldigi, it will change to LSB-D1 on the IC-7610 but not to RTTY.
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Reading the Icom IC-7610 advanced manual, it would appear the IC-7610's RTTY mode is strictly for use when using the radio without a PC. ?This isn't intuitive to me, but that's probably explains what I am seeing.
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I'm off to re-review K0PIR's information and other data on the web as to how to use fldigi using FSK via WinKeyer and the IC-7610.
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Sidenote: I'm using fldigi on a Mac without a corresponding logger to control fldigi. ?I do have MacLoggerDX logging QSOs from fldigi when they are logged there, but that's all.
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Larry KS9J |
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Larry, You did not say which rig control method? you are using. May I suggest using flrig as the control agent; and also use the flrig FSK interface, shown here for the IC7300 on Linux: This works identically on my M2 mini, Intel-mini, M4 Airbook Pro, and Windows-11.? See . 73, David On Mon, Jan 27, 2025 at 7:07?AM Larry Haak (KS9J) via <ks9j=pax-domini.org@groups.io> wrote:
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Hello David,
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I'm currently using RigCAT using the instructions from here:
It works great for AFSK.
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Be as it may, my question was specifically regarding receive, not transmit when in "RTTY" mode. ?Since my last post, I have confirmed that the "RTTY" mode on the IC-7610 is strictly for use with the built-in RTTY functionality on the IC-7610, not for use with a PC and RTTY software. ?This is described in the IC-7610 Advanced Manual and the Icom IC-7610 guide book written by Andrew Barron, ZL3DW. ?Given that, I'll continue to use LSB-D1 mode on the IC-7610 for both receive and transmit via fldigi.
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Once I get my patch cable made between the WinKeyer and the IC-7610, I'll try RigCAT initially. ?If that doesn't work, I'll explore flrig as you suggested.
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73,
Larry KS9J |
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Hello again,
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Yes, scratch everything I said earlier. ?For FSK on the IC-7610, I most certainly need to be in "RTTY" mode on the rig.
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The reason for the offset in my screenshot is that the sweet spot frequency for FSK RTTY is at 2210 Hz, not 1500 Hz for AFSK RTTY. ?Once I set the sweet spot frequency in fldigi, the signal was centered on the fldigi waterfall.
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After extensive Google searches, I found this document linked in a post written by Bo, W4GHV, in the Winfldigi groups.io group:
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I have contacted Bo, and he confirms this is the latest document (written a few years back). ?He has volunteered to assist me if I run into any troubles.
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Thanks, everyone, for your inputs!
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Larry KS9J |
Larry Haak (KS9J)
Dave, W1HKJ