Wes:
Yes but I assume you have have used or use other xcvrs as well. As a general
comment, that doesn’t change the idea that using ALC to control a xcvr’s power
to one’s linear isn’t the purpose of ALC and would seem to not be a very
healthy practice. If one were to choose that path, then
You do know that the K3(S) uses a slow ALC system for power control don't you?
Wes N7WS
On 7/12/2019 8:53 PM, Brian Denley wrote:
Nothing when that’s what you want. But using ALC to control xcvr power is
uncontrolled compression that may or may not be desired.
Brian
KB1VBF
Sent from my
Nothing when that’s what you want. But using ALC to control xcvr power is
uncontrolled compression that may or may not be desired.
Brian
KB1VBF
Sent from my iPad
> On Jul 12, 2019, at 4:09 PM, Wes wrote:
>
> And what exactly is the problem with compression? It's used all over the
>
A common cause of incidental AM is ripple in the crystal filter(s) in
use. One reason I went to the 2.8 kHz filter was that it had less
ripple, and the difference was obvious on RTTY.
73, Jim K9YC
On 7/12/2019 3:45 PM, Conrad PA5Y wrote:
It should be mentioned that FT8 and JT65 are constant
Tonight is the 20th anniversary of the end of marine radiotelegraphy. You can
listen in to the activities detailed below. KFS is currently booming in here
on 12MHz on my K3.
Maritime Radio Historical Society
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Maritime Radio Historical Society
Hey Bob,
Long time.
I actually used the Jupiter you and I talked about awhile back to listen before
going “live’.
I don’t have the wider filter yet, still looking for a 15kHz filter. The guy I
bought it from pulled the 6kHz, not a big deal as I am going to get the 15kHz
someday.
The hole is
First, how have you determined that you will need EQ for AM? With the
stock SSB filter you won't get AM to sound good. And with the 6 kHz AM
filter, that depends largely on the type of mike being used and your
mike technique. I use the same mike and mike technique and EQ for SSB
as I do
Do you have either the 6 or 13 KHz filter?
If you’re transmitting through the SSB filter, your bandwidth is going to be
substantially constricted, and may sound pretty muddy.
Grant NQ5T
K3 #2091 KX3 #8342
> On Jul 12, 2019, at 7:07 PM, Frank Krozel wrote:
>
> So let me start out by saying I
Following Scott McDonald's off list suggestion I went through with the
cover off and wiggled the coax internal to the KX3 hoping to find an
intermittent connection. I ended up discovering a kink in the coax from the
antenna connector to the 2m board. I'm going to replace that and see if
that was
Actually, gain compression reduces "gain" not dynamic range. All signals are
reduced in amplitude by the same number of dB. This is the only way it doesn't
introduce distortion.
This reminds me of the endless discussions about RX AGC where everyone has their
favorite combination of rf-gain,
So let me start out by saying I am a CW guy but listen to the AM guys on the
weekends.
Reminds me of when I just got into ham radio back in 1968. They guys were on
1805 here in Chicago area.
I have not yet bought the 13kHz filter so I am strapped with what I have in it
now, stock.
Can anyone
It should be mentioned that FT8 and JT65 are constant envelope and therefore
there should not be any AF envelope to follow. Actually when I recently
measured the AF output from WSJT-X there was a tiny amount of AM, around 1.4%
in fact which so small as to be of no consequence. ALC can
Well ... I think it depends on your definition of distortion. One can
argue that, if the RF envelope does not exactly equal the original AF
envelope, the signal has been distorted and that is certainly the case
when the dynamic range has been reduced with compression. It doesn't
increase the
Don't confuse compression and clipping. Compression reduces dynamic range
while clipping sets a hard ceiling and does generate distortion. Compression
used correctly does not generate distortion.
73
Bob, K4TAX
Sent from my iPhone
> On Jul 12, 2019, at 4:00 PM, Wes wrote:
>
> What
What distortion?
On 7/12/2019 1:15 PM, Jim Rhodes wrote:
Nothing when it is done correctly on a mode that can stand the distortion. I
personally won't use it on digital modes as my rigs tend to turn it off by
default.
Jim Rhodes
K0XU
On Fri, Jul 12, 2019, 15:10 Wes
I'm talking about feeding detected audio to the computer for decoding.
And not all digital formats are the same -- going from one to another
takes time and processor power, and, depending on how data is encoded,
may be problematic.
73, Jim K9YC
On 7/12/2019 12:49 PM, Andy Durbin wrote:
"The
Nothing when it is done correctly on a mode that can stand the distortion.
I personally won't use it on digital modes as my rigs tend to turn it off
by default.
Jim Rhodes
K0XU
On Fri, Jul 12, 2019, 15:10 Wes wrote:
> And what exactly is the problem with compression? It's used all over the
>
And what exactly is the problem with compression? It's used all over the place.
Wes N7WS
On 6/28/2019 11:38 AM, Brian Denley wrote:
I have always thought that ALC is not appropriate for power control. It’s a
protection system. Over use of ALC acts like compression. No?
Brian
KB1VBF
Sent
"The spec that matters is the linearity of the A/D at the extremes of the
dynamic range."
Jim,
A bit more information please. Are you talking about TX or RX? Are you
talking about the A/D that is typically in the TX path between the CODEC and
DSP of a modern transceiver or perhaps an A/D
To put this in context, WSJT-X works at 16-bit 48 kHz. The spec that
matters is the linearity of the A/D at the extremes of the dynamic range.
73, Jim K9YC
On 7/12/2019 8:02 AM, Andy Durbin wrote:
"It was interesting to see that the shared data sheet shows even the latest version
of the
"It was interesting to see that the shared data sheet shows even the latest
version of the PCM2903 is not recommended for new designs"
Well, the PCM2903C seems to be the latest version of the PCM2903 and it does
not have the NRND designation. The PCM2901 datasheet reference to PCM2903E is
"The TI PCM2901, I am told by a Watsonville rep, was used in the K3-S."
Thanks.
The PCM2901 and PCM2903 appear to be be very similar. The only obvious
difference I found is in support of S/PDIF. It was interesting to see that the
shared data sheet shows even the latest version of the PCM2903
Andy: In answer to your two questions:
The TI PCM2901, I am told by a Watsonville rep, was used in the K3-S.
Whether it was used in early production runs, or used in later production
runs, I do not know. It comes in two versions: Model E and Model EG4. The
data sheet and other specs can be
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