开云体育

Thanks, everyone for your input. I’ve loaded the latest per Bruce's recommendation.?

开云体育

Jim, I would load the current versions of the FLdigi Suite of programs.

They are:

Fldigi V 4.2.06

FLmsg V 4.0.23

FLamp V 4.2.14

In the readme.txt, you can see what was changed? in each of the programs, if you would be interested.

Bruce WA1YZN

开云体育

de k3eui? Barry

Kennett Square PA

Due to my high noise level (over S9) on 80m and 40m, I often will use the? REMOTE SDR? at? k3fef.com (NE PA) for digital sound card nets

like the PA NBEMS or MidAtlantic NBEMS.

To check the accuracy of the k3fef radio, I tune it to? 14.999 MHz and click on USB (upper sideband)

Since ? WWV?? carrier is right on 15.000 MHz, by tuning 1 kHz low on the k3fef VFO, I will hear a steady tone (15.000-14.999)

of 1 kHz or 1000 Hz on the sound card output of k3fef.com? on the internet connection.

This is not the beep beep tones that WWV sends out at the start of each second.

This is the steady ? BEAT FREQ?? of WWV when the K3FEF VFO is purposely tuned 1 kHz low on the k3fef dial.

That audio from k3fef is piped into a second sound card on my home computer, and I use FLDIGI to monitor that sound.

Choose the Fldigi mode? "FREQ ANALYSIS" .??

The waterfall of Fldigi? shows the steady tone close to 1000 Hz

(it also shows the beep-beep audio sounds +/- 500 Hz off but ignore that)

But if the steady tone is not exactly on 1000 Hz on the FLDIGI Waterfall, then the VFO at K3FEF is off just a bit on upper sideband mode.

(do not use AM or? LSB or lower sideband for this test)

I allow the FLDIGI?? FREQ ANALYSIS mode a minute or so to center in on that steady tone, and it tells me that rather than 1000.00 Hz (if k3fef.com VFO were really accurate)

the the audio is at 1004.689 Hz?? (see attached image)

So that tells me that the VFO at the remote SDR K3FEF is "off"? (high) by about 4 or 5 Hz.

That is, the bfo at that radio at k3fef.com? is just a bit "off".

No one likely cares about a 5 Hz "error" at 15 MHz,ut it does throw off copy of MFSK32 signals we use on the NBEMS nets.

I either have to move the center frequency of the FLDIGI WF to the center of the signal coming from k3fef.com

or

I can adjust the VFO frequency at k3fef.com to compensate for the 5 Hz "error" in that VFO.

Either way works.

Not bad!!

2 year old laptop running Windoze 11, wiped and reloaded. Ready for fldigi suite.

I’m currently running
Fldigi 4.2.06
Flmsg 4.0.23
Flamp 2.2.10

All are well behaved and play well with others. Should I use the latest or reload these I have (assuming they’re still available)

Jim Falls K6FWT

开云体育

The last sound card to calibrate via the Fldigi WWV mode? is a 10 yr old USB Sound Blaster that has very low noise.

I usually use this sound card with a RSPduo SDR (hardware) which tunes HF, VHF, UHF and all modes.

Right now, this is set to CHU Canada on 7850 kHz upper sideband with a 2 kHz filter BW.

Fantastic signal into the Phila region of SE Pa.

After setting the sample rate to NATIVE and the corrections in Fldigi to 0 ppm, the result was nearly perfect after ten minutes.

?

So all of my sound cards now have "calibrations" in ppm with the largest one? +65 ppm.

Has anyone found a large calibration correction (hundreds of ppm) using the WWV (5, 10, 15, 20 MHz) or CHU? (7850 kHz) time ticks?

de k3eui

开云体育

Tonight we used? THOR 32? mode on the CCAR UHF FM net. (Chester PA)

Thor modes consist of 18 tones, sent one at a time, at 32 baud.

This is a modest audio bandwidth - about 600 Hz.

Here is what the RF Spectrum? looks like, received on a SDR in Kennett Square.

Spectrum Analyzer is by Andrew (free).

You can clearly see the first three "sidebands" on this FM modulation

The modulation around the carrier is the PL tone sidebands of ?100 Hz

The 8 kHz is just for scale - not the true bandwidth.

de k3eui? barry2

When trying to build fldigi 4.2.06.25 on macOS 15.3.2 with Xcode command tools, the following error emerged:

  CXX      config_script/fldigi-create_default_script.o
  CXX      config_script/fldigi-run_scripts.o
config_script/run_scripts.cxx:185:10: fatal error: 'scripts.h' file not found
  185 | #include "scripts.h"
      |          ^~~~~~~~~~~
1 error generated.

I couldn't find the file "scripts.h" in the tar archive. Any fixes?

Kenji Rikitake, JJ1BDX / N6BDX

Good Morning All,

Our local net has been trying Flmsg ARQ mode. I noticed in the user manual the menu selection is different than my Flmsg version 4.0.23.
The manual has a menu selection titled ARQ and when you select it there are 3 selections, Open/Close, Received Msgs and Events.
On my Flmsg there is a selection called Utilities which only has Received Msgs and Events.
The manual says if you select Open/Close it expands the bottom of Flmsg to include ARQ and the Send button along with the place to enter a callsign.
On my Flmsg the bottom part, ARQ, is always open. I've had stations confused with seeing the Send button and during regular Flmsg transfer hit the Send instead of the AutoSend at the top.
I was wondering if there is a setting that makes the Flmsg program behave the same way as the user manual.

73, Ron NY3J

开云体育

Setting up your 2m/70cm FM rig with an external Sound Card

It is easy to under modulate or to over modulate an FM rig with an external sound card.

If you can monitor your own signal, the old guideline was that the sound card audio should be NO LOUDER

than the audio with your own microphone using your own voice.? But that is very crude.

Sounds like VARA FM? and? 8PSK? do not sound anything like a human voice - so begin with a simple TUNE signal.

Here is an optimally modulated ? THOR 22 ? signal sent on 2m FM (145.690 MHz) with an

Icom 2820 dual-band FM rig and a DRA SR (Masters Communications sound card).

The THOR22 audio is centered at 1500 Hz on the Fldigi waterfall.

RF Spectrum interpretation:

When the amplitude of the RF carrier (vfo at 145.690) equals the amplitude of the pair of first sidebands (+/- 1.5 kHz from carrier)

then the "MODULATION INDEX" is 1.5? (Bessel method)

The?? DEVIATION ? of the signal is established as the product of the modulation index multiplied by the audio frequency.

Using the 1500 Hz TUNE in Fldigi, that comes to a deviation (1.5 x @1500 Hz audio) of?? 2.25 kHz? (a bit conservative)

Since this signal was sent with the Icom 2820 set to 1200 baud (TX) then the radio's? transmit? "PRE-EMPHASIS"

will add amplitude to higher pitch audio at a rate of ? + 6 dB/octave.

So the deviation is a bit more for any audio at 2000 Hz, a bit less for any audio at 1000 Hz,

if the mode is that wide (say a 1 kHz mode like MFSK64)

But since?? THOR22?? is only 500 Hz wide, this "pre-emphasis"? of the TX signal at 1200 baud plays almost no role.

The deviation is about?? 2.2 kHz ? for the entire THOR22 signal.

The width marker? (12 kHz) on the image is just for SCALE value - not a true bandwidth.

Note each additional sideband pair is WIDER -? how come?

We can use the first Saturday of each month for those ops in the Phila region to test their 2m FM deviation

using the repeater on 147.270 (N3KZ) with a PL 77 Hz on the input only.? But NOT in April due to a SET exercise.

de barry2? k3eui

2.2.13 is broken and should be removed from your system. Use the current version 2.2.14. The last time I checked Dave's website still indicates 2.2.13 is the latest. Which is not the case.
Robert

开云体育

Hi Neil

I remember this problem to do with flamp 2.2.13 maybe mid last year. Something about a wrong XML response or timing issue? Solved in my case at the time by going back to 2.2.12.4, but now with 2.2.14 and later fldigi alphas (using 4.2.06.24) it all works fine. There may have also been part of the fix in an early 4.2.06.alpha. 24 seems quite bullet-proof so maybe try that along with flamp 2.2.14?

Pretty sure it was discussed in this group July 2024

Cheers Bob VK2YQA