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The operating manual explains how to set the transmit audio for an HF transceiver, but seems to give no guidance for setting up the audio for VHF FM.
We have the (unverified) information that the recommended deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable estimate of our audio level when using a SignaLink?
Thanks....
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A member of one of our local digital training nets did have the
proper equipment to measure on air signals. We spent one net with
him monitoring each of our signals (using FLDIGI) and providing
feed back.
Maybe check around your area and see if someone (say someone that
works in Land Mobile Radio and has access to the equipment) could
do that during a net?
One of our local clubs has a person that works in one of the
local radios shops with access to a service monitor. They held a
special club meeting where folks could bring their gear in and
have it spec'ed out.
Just a couple of ideas
73
Randy KA0AZS
On 10/26/2020 01:13, Neil Preston W0NRP
via groups.io wrote:
The operating manual explains how to set the transmit audio for
an HF transceiver, but seems to give no guidance for setting up
the audio for VHF FM.
We have the (unverified) information that the recommended
deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and
most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable
estimate of our audio level when using a SignaLink?
Thanks....
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|
Oh, and forgot to mention in my previous reply, it turns out the
optimum settings on VHF/UHF for my set up (IC-706MKIIG on low
power and SignaLink) was setting all three knobs at about the 11
O'Clock position when using FLDIGI (usually MT-63 2KL) and setting
the DLY to almost minimum when using WinLink. YMMV.
Hope this helps
73
Randy KA0AZS
On 10/26/2020 01:13, Neil Preston W0NRP
via groups.io wrote:
The operating manual explains how to set the transmit audio for
an HF transceiver, but seems to give no guidance for setting up
the audio for VHF FM.
We have the (unverified) information that the recommended
deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and
most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable
estimate of our audio level when using a SignaLink?
Thanks....
|
|
|
A few years ago, I had an IC706MK2G and also made two
installations of Fldigi with one for the HF side and the other for
VHF/UHF. The interface between the radio and computer was (is
still) a SignaLink USB with the cable from Tiger Tronics getting
the signals to and from the radio. The settings I used for the SL
USB were to have both the TX and RX (the transmit and receive)
settings at mid-point or about 12:00 and the DLY set at full
counter clockwise (CCW). The power TO the radio (from computer to
radio) was set so that the radio would transmit a clean signal at
not over half power for whatever band had been selected.
James Good kd5vxh
toggle quoted messageShow quoted text
On 10/26/20 1:04 AM, Randy Allen wrote:
Oh, and forgot to mention in my previous reply, it turns out
the optimum settings on VHF/UHF for my set up (IC-706MKIIG on
low power and SignaLink) was setting all three knobs at about
the 11 O'Clock position when using FLDIGI (usually MT-63 2KL)
and setting the DLY to almost minimum when using WinLink. YMMV.
Hope this helps
73
Randy KA0AZS
On 10/26/2020 01:13, Neil Preston
W0NRP via groups.io wrote:
The operating manual explains how to set the transmit audio
for an HF transceiver, but seems to give no guidance for
setting up the audio for VHF FM.
We have the (unverified) information that the recommended
deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and
most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable
estimate of our audio level when using a SignaLink?
Thanks....
|
|
|
My opinion as somebody who used to conduct a ton of NBEMS training...
Getting the modulation perfectly set on VHF/UHF FM isn't worth the time and trouble. Adjust so that the transmitted NBEMS audio is close to that of a spoken voice. Sometimes "Good Enough" is good enough.
73, Harry Bloomberg W3YJ
A few years ago, I had an IC706MK2G and also made two
installations of Fldigi with one for the HF side and the other for
VHF/UHF. The interface between the radio and computer was (is
still) a SignaLink USB with the cable from Tiger Tronics getting
the signals to and from the radio. The settings I used for the SL
USB were to have both the TX and RX (the transmit and receive)
settings at mid-point or about 12:00 and the DLY set at full
counter clockwise (CCW). The power TO the radio (from computer to
radio) was set so that the radio would transmit a clean signal at
not over half power for whatever band had been selected.
James Good kd5vxh
On 10/26/20 1:04 AM, Randy Allen wrote:
Oh, and forgot to mention in my previous reply, it turns out
the optimum settings on VHF/UHF for my set up (IC-706MKIIG on
low power and SignaLink) was setting all three knobs at about
the 11 O'Clock position when using FLDIGI (usually MT-63 2KL)
and setting the DLY to almost minimum when using WinLink. YMMV.
Hope this helps
73
Randy KA0AZS
On 10/26/2020 01:13, Neil Preston
W0NRP via groups.io wrote:
The operating manual explains how to set the transmit audio
for an HF transceiver, but seems to give no guidance for
setting up the audio for VHF FM.
We have the (unverified) information that the recommended
deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and
most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable
estimate of our audio level when using a SignaLink?
Thanks....
|
|
|
Hi All,
To adjust audio-levels for FM you can listen to your own voice-signal through a scanner and adjust your digital-Tx-audio to be slightly quieter than voice (to prevent overdriving). Better to have a too-quiet signal than a too-loud one.
The modes in Fldigi, even the 8PSK modes, are designed to be adjusted by ear without a deviation meter needed. This is very handy in an emergency situation, hihi.
Since people are using Fldigi more for FM, the manual should have some kind of FM adjustment procedure or info added. Here is a link for adjusting audio for 8PSK: Can apply the same procedure for all Fldigi modes on FM.
73, John Phelps KL4YFD
On Mon, Oct 26, 2020 at 9:18 AM Harry Bloomberg < hbloomb@...> wrote: My opinion as somebody who used to conduct a ton of NBEMS training...
Getting the modulation perfectly set on VHF/UHF FM isn't worth the time and trouble. Adjust so that the transmitted NBEMS audio is close to that of a spoken voice. Sometimes "Good Enough" is good enough.
73, Harry Bloomberg W3YJ
A few years ago, I had an IC706MK2G and also made two
installations of Fldigi with one for the HF side and the other for
VHF/UHF. The interface between the radio and computer was (is
still) a SignaLink USB with the cable from Tiger Tronics getting
the signals to and from the radio. The settings I used for the SL
USB were to have both the TX and RX (the transmit and receive)
settings at mid-point or about 12:00 and the DLY set at full
counter clockwise (CCW). The power TO the radio (from computer to
radio) was set so that the radio would transmit a clean signal at
not over half power for whatever band had been selected.
James Good kd5vxh
On 10/26/20 1:04 AM, Randy Allen wrote:
Oh, and forgot to mention in my previous reply, it turns out
the optimum settings on VHF/UHF for my set up (IC-706MKIIG on
low power and SignaLink) was setting all three knobs at about
the 11 O'Clock position when using FLDIGI (usually MT-63 2KL)
and setting the DLY to almost minimum when using WinLink. YMMV.
Hope this helps
73
Randy KA0AZS
On 10/26/2020 01:13, Neil Preston
W0NRP via groups.io wrote:
The operating manual explains how to set the transmit audio
for an HF transceiver, but seems to give no guidance for
setting up the audio for VHF FM.
We have the (unverified) information that the recommended
deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and
most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable
estimate of our audio level when using a SignaLink?
Thanks....
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You're right...it's been a while since I've done NBEMS on VHF/UHF FM. Slightly lower audio level than voice is indeed the best. And a deviation meter is just not needed.
73, Harry W3YJ
On Mon, Oct 26, 2020 at 1:10 PM KL4YFD ham < kl4yfd@...> wrote: Hi All,
To adjust audio-levels for FM you can listen to your own voice-signal through a scanner and adjust your digital-Tx-audio to be slightly quieter than voice (to prevent overdriving). Better to have a too-quiet signal than a too-loud one.
The modes in Fldigi, even the 8PSK modes, are designed to be adjusted by ear without a deviation meter needed. This is very handy in an emergency situation, hihi.
Since people are using Fldigi more for FM, the manual should have some kind of FM adjustment procedure or info added. Here is a link for adjusting audio for 8PSK: Can apply the same procedure for all Fldigi modes on FM.
73, John Phelps KL4YFD
On Mon, Oct 26, 2020 at 9:18 AM Harry Bloomberg < hbloomb@...> wrote: My opinion as somebody who used to conduct a ton of NBEMS training...
Getting the modulation perfectly set on VHF/UHF FM isn't worth the time and trouble. Adjust so that the transmitted NBEMS audio is close to that of a spoken voice. Sometimes "Good Enough" is good enough.
73, Harry Bloomberg W3YJ
A few years ago, I had an IC706MK2G and also made two
installations of Fldigi with one for the HF side and the other for
VHF/UHF. The interface between the radio and computer was (is
still) a SignaLink USB with the cable from Tiger Tronics getting
the signals to and from the radio. The settings I used for the SL
USB were to have both the TX and RX (the transmit and receive)
settings at mid-point or about 12:00 and the DLY set at full
counter clockwise (CCW). The power TO the radio (from computer to
radio) was set so that the radio would transmit a clean signal at
not over half power for whatever band had been selected.
James Good kd5vxh
On 10/26/20 1:04 AM, Randy Allen wrote:
Oh, and forgot to mention in my previous reply, it turns out
the optimum settings on VHF/UHF for my set up (IC-706MKIIG on
low power and SignaLink) was setting all three knobs at about
the 11 O'Clock position when using FLDIGI (usually MT-63 2KL)
and setting the DLY to almost minimum when using WinLink. YMMV.
Hope this helps
73
Randy KA0AZS
On 10/26/2020 01:13, Neil Preston
W0NRP via groups.io wrote:
The operating manual explains how to set the transmit audio
for an HF transceiver, but seems to give no guidance for
setting up the audio for VHF FM.
We have the (unverified) information that the recommended
deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and
most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable
estimate of our audio level when using a SignaLink?
Thanks....
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|
|
Dave
Every signal generated by
fldigi will have a peak-to-peak audio signal that is equal to or
less than the "Tune" signal. If you follow the advice of Harry
or John using the tune signal then all others will be OK.
David, W1HKJ
toggle quoted messageShow quoted text
On 10/26/20 12:10 PM, KL4YFD ham wrote:
Hi All,
To adjust audio-levels for FM you can listen to your
own voice-signal through a scanner and adjust your
digital-Tx-audio to be slightly quieter than voice (to
prevent overdriving).
Better to have a too-quiet signal than a too-loud
one.
The modes in Fldigi, even the 8PSK modes, are
designed to be adjusted by ear without a deviation meter
needed.
This is very handy in an emergency situation, hihi.
Since people are using Fldigi more for FM, the manual
should have some kind of FM adjustment procedure or info
added.
Here is a link for adjusting audio for 8PSK:
Can apply the same procedure for all Fldigi modes on
FM.
73,
John Phelps
KL4YFD
On Mon, Oct 26, 2020 at 9:18
AM Harry Bloomberg < hbloomb@...> wrote:
My opinion as somebody who used to conduct a ton of
NBEMS training...
Getting the modulation perfectly set on VHF/UHF FM
isn't worth the time and trouble. Adjust so that the
transmitted NBEMS audio is close to that of a spoken
voice. Sometimes "Good Enough" is good enough.
73,
Harry Bloomberg W3YJ
A few years ago, I had an IC706MK2G and also made
two installations of Fldigi with one for the HF side
and the other for VHF/UHF. The interface between the
radio and computer was (is still) a SignaLink USB
with the cable from Tiger Tronics getting the
signals to and from the radio. The settings I used
for the SL USB were to have both the TX and RX (the
transmit and receive) settings at mid-point or about
12:00 and the DLY set at full counter clockwise
(CCW). The power TO the radio (from computer to
radio) was set so that the radio would transmit a
clean signal at not over half power for whatever
band had been selected.
James Good kd5vxh
On 10/26/20 1:04 AM, Randy Allen wrote:
Oh, and forgot to mention in my previous reply,
it turns out the optimum settings on VHF/UHF for
my set up (IC-706MKIIG on low power and SignaLink)
was setting all three knobs at about the 11
O'Clock position when using FLDIGI (usually MT-63
2KL) and setting the DLY to almost minimum when
using WinLink. YMMV.
Hope this helps
73
Randy KA0AZS
On 10/26/2020 01:13, Neil Preston W0NRP via groups.io wrote:
The operating manual explains how to set the
transmit audio for an HF transceiver, but seems
to give no guidance for setting up the audio for
VHF FM.
We have the (unverified) information that the
recommended deviation level is approximately 3
KHz.
We have been struggling with this in our
training nets, and most of us do not have
deviation measurement capability.
What methods might allow us to make some kind of
reasonable estimate of our audio level when
using a SignaLink?
Thanks....
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|
|
Neil, W0NRP,
I may be answering the wrong question but this
has been my
experience with HF sound card and VHF sound card
settings using a signalink.
On HF you put the radio power on 100 %
and adjust the power level
with the signalink TX pot. You can adjust it down to 1 or 2 watts.
I usually
set mine to about 25 to 35 watts depending on the band and
conditions.
While observing the waterfall on FLdigi, adjust
the RX pot until you
have about 50% yellow and 50% blue. This will bring out the weak
signals but
not too weak.
For VHF you can hit the tune button in
the program and
listen on your HT. Adjust theTX volume up until it is distorted
then adjust it
down until it is undistorted.
This also works for VHF using other
sound card modes.
73,
Steve / W8TER
toggle quoted messageShow quoted text
On 10/26/2020 1:13 AM, Neil Preston
W0NRP via groups.io wrote:
The operating manual explains how to set the transmit audio for
an HF transceiver, but seems to give no guidance for setting up
the audio for VHF FM.
We have the (unverified) information that the recommended
deviation level is approximately 3 KHz.
We have been struggling with this in our training nets, and
most of us do not have deviation measurement capability.
What methods might allow us to make some kind of reasonable
estimate of our audio level when using a SignaLink?
Thanks....
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