Fred and Van,
Some comment follows.
On June 09, 2012 at 7:03 AM, Fred Jensen K6DGW wrote:
snip
OK Van, multiple questions. What most folks call splatter is caused by
driving the last amplifier stage into saturation [i.e. it can't produce
any more power so it clips off the peaks]. It
On 6/9/2012 5:14 AM, Geoffrey Mackenzie-Kennedy wrote:
the reason why a typical ALC can be responsible for splatter is because
these ALC systems sample the output of an amplifier and/or exciter, and due
to time delays cannot throttle back the drive power immediately.
The ONLY proper ways to
Subject: Re: [Elecraft] Interpretation of P3 display
Fred and Van,
Some comment follows.
On June 09, 2012 at 7:03 AM, Fred Jensen K6DGW wrote:
snip
OK Van, multiple questions. What most folks call splatter is caused
by driving the last amplifier stage into saturation [i.e. it can't
produce
:
What have these last few posts got to do with interpretation of the P3
display?
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The replies directly answer the initial poster's question about
the cause of what his P3's display was likely showing.
73!
Ken - K0PP
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Anything that represents a transmit non-linearity can cause splatter,
and a very quick change in gain represents a non-linearity.
My ICOM 756Pro was one of those offenders that used an internal ALC to
set the power level. The internal delay in the ALC caused nasty power
spikes at the
David, what are you saying? Do the GU74bs dislike or do they tolerate the
spike? You left out an important word in your previous statement. Thanks,
Roy W4WFB
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Sorry ...
Amplifiers with a pair of GU-74Bs typically want to be driven at less
than 50 watts for full legal power, and from what I understand (I'm not
an expert) their screen grids can be damaged with excess drive levels.
Those amplifiers almost always have pretty sophisticated drive
Hi Harold,
On 6/8/2012 2:45 PM, Harold V wrote:
I have a question for the group regarding interpretation of the P3 display of
SSB signals.
Primarily I use it to spot stations on quiet bands or spot openings on busy
bands. But I am trying to gain a better understanding of what it is showing
Of course it dislikes the spike as every other tube or transistor does.
However some of the GU74B amplifiers have sophisticated protection circuits
that every spike trips , while an unprotected tube amplifier wouldn't notice
it.
73, Val LZ1VB
David, what are you saying? Do the GU74bs
Gu74B, aka 4CX800A, is a tetrode, a pair used in Alpha manual tune amps
since the 91B, replaced recently with 4CX1000A's in the Alpha 8410. The
4CX1000A's have the same protection needs. The same protection needs exist
for the 4CX150A's in my ancient Tokyo Hy-Power HL-1K, but it's not there
and
It is not unusual to see a wide variation in SSB signal bandwidths having
nothing to do with improper operation or distortion products.
Some rigs, especially older rigs, have wider filters or filters with much
more shallow skirts than others.
Then there are phasing rigs with only audio
A very good indication of an overdriven amplifier or otherwise distorted
signal is when you see energy on the wrong side of the (suppressed) carrier
of an SSB signal, as well as the expected sideband energy. This is obvious
on the P3, and has a completely different appearance than a signal that
June 2012 4:46 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Interpretation of P3 display
I have a question for the group regarding interpretation of the P3 display
of SSB signals.
Primarily I use it to spot stations on quiet bands or spot openings on busy
bands. But I am trying to gain
I have a question for the group regarding interpretation of the P3 display of
SSB signals.
Primarily I use it to spot stations on quiet bands or spot openings on busy
bands. But I am trying to gain a better understanding of what it is showing me
regarding the quality of signals as well.
I
On 6/8/2012 11:45 AM, Harold V wrote:
Is this what is known as splatter?
The triangular shape is most likely phase noise.
Is the station overdriving their transmitter or linear?
The most likely causes are phase noise produced by inferior transceiver
designs, and distortion products in
Of Harold V
Sent: Saturday, 9 June 2012 4:46 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Interpretation of P3 display
I have a question for the group regarding interpretation of the P3 display
of SSB signals.
Primarily I use it to spot stations on quiet bands or spot openings on busy
bands. But I
On 6/8/2012 11:45 AM, Harold V wrote:
I have a question for the group regarding interpretation of the P3 display of
SSB signals.
Primarily I use it to spot stations on quiet bands or spot openings on busy
bands. But I am trying to gain a better understanding of what it is showing
me
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