G'day,
When I run the K2/100 into my Acom 1000 I usually set the requested power
to about 30 - 35W. I seldom drive the amp more than 400 - 500W output.
On CW all is fine but on SSB I notice there is a severe overshoot on the
output for the first syllable after changing to TX and after a few se
Mike, I notice the opposite (but when running full power: 100-110W).
The first couple of syllables are lower, and then it kicks up. I'll try
reducing power and see if it goes in the other direction.
I was told that the previous effect was normal (action of the ALC).
Bill
W1PA
K2/100 #61
__
Same thing here, with or without an external amp. CW is as expected. But
when switching to SSB I will get full output (sometimes well over 100 watts)
at any power setting over 11 watts and sometimes cause a shutdown of my
power supply and a reboot of the K2/100. This behavior goes away when
I think Don's observations sound like the problem I
and a few others have had. See, for example the
symptoms described here:
http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-03/msg00676.html
http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-12/msg00408.html
These two, at least, we
- Original Message -
From: "Steve Kavanagh" <[EMAIL PROTECTED]>
To:
Sent: Wednesday, November 01, 2006 1:55 PM
Subject: Re: [Elecraft] SSB output overshoot
I think Don's observations sound like the problem I
and a few others have had. See, for example the
symptoms d
t: Re: [Elecraft] SSB output overshoot
I think Don's observations sound like the problem I
and a few others have had. See, for example the
symptoms described here:
http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-03/msg00676.html
http://www.ac6rm.net/mailarchive/html/elecraft-list/
--- Geoffrey Mackenzie-Kennedy
<[EMAIL PROTECTED]> wrote:
> Have you any thoughts about what might be causing
> Don's K2/100 to behave
> when he switches the display from RF to ALC?
Yes, that is quite unexpected ! David, M0DHO, brought
this peculiarity to my attention and I noticed the
same be
|
|
| - Original Message -
| From: "Steve Kavanagh" <[EMAIL PROTECTED]>
| To:
| Sent: Wednesday, November 01, 2006 5:55 AM
| Subject: Re: [Elecraft] SSB output overshoot
|
|
| >I think Don's observations sound like the problem I
| > and a few others have had. S
as something I could do. Do you (or
| anyone) have the details of the necessary resistor changes?
|
| Don K7FJ
|
|
|
| - Original Message -
| From: "Steve Kavanagh" <[EMAIL PROTECTED]>
| To:
| Sent: Wednesday, November 01, 2006 5:55 AM
| Subject: Re: [Elecraft] SSB output ove
G'day,
I haven't found any difference switching about from RF to ALC and back to
my overshoot problem. Neither any effect by sneaking up on the requested
power from a previously lower setting or down from a higher setting.
Regards,
Mike VP8NO
| > Have you any thoughts about what might be cau
G'day,
| It's not as elegant as having an automatic circuit handle the issue, but
one
| way to reduce the amount of ALC and associated "overshoot" on 40 is to
| reduce the audio to the rig. Switch in the audio attenuator at the MENU
or
| otherwise reduce the audio to the mic jack until you are get
At 22:55 02/11/2006, Mike Harris wrote:
G'day,
I have now done the resistor mod to no effect and will probably revert
'cos I don't like how I had to add the 1K0 in series with the base of Q1.
Hi Mike,
ISTR making the ALC *very* much more aggressive to tackle this,
especially on 80m. I think
On Friday, November 03, 2006 at 3:27 PM, David M0DHO wrote:
.I have yet to see a detailed description how BOTH of these control loops
work, so if anyone has any more details on this, I'd appreciate the wisdom
being shared :-)
---
Lik
Geoff,
Your question is a lot easier than the control loop question.
The series resistor R66 on the RF board will limit the response of the basic
detector in the base K2 when the other devices are installed - consider that
the KPA100 (and other options that provide the VRFDET signal) use an op amp
Don,
Thank you for putting me straight on this. On the control loop question I
agree with David, M0DHO, that an explanation of the workings of the ALC
system would be useful not only in its dynamic state but also in its static
state.
73,
Geoff
GM4ESD
- Original Message -
Geoff,
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