I think the only thing that is for sure is that this is very poorly documented.
The schematic shows two resistors, the assembly manual shows one, and the
correct value of the one (by my measurement) is unknown. Whether or not it is,
or isn't, used is another unknown. It seems to me that
" Have we, in fact, established that this attenuator is enabled at any point of
the tune cycle? Because if not, then we're all spun up for nothing."
KAT500 Serial Command Reference Revised 8/18/2021 firmware version 02.00 says:
"ATTN Enable Attenuator GET format: ATTN; SET/RESPONSE format:
Have we, in fact, established that this attenuator is enabled at any point of
the tune cycle? Because if not, then we're all spun up for nothing.
Is it reasonable to believe that the attenuator was one of those design
elements that might have been deemed necessary at one time but then the
"I took the cover off mine and verified that the shunt resistor was missing and
the series one measured 228 ohm. Clearly, if this is dynamically switched
while seeking a match the poor exciter is going to be totally confused. "
The list and private replies I have seen seem to show the
3:1 or so.
73
Bob, K4TAX
On 12/12/2021 7:24 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 4
Date: Fri, 10 Dec 2021 13:30:16 +
From: Andy Durbin
To:"elecraft@mailman.qth.net"
Subject: [Elecraft] KAT500 Attenuator
Message-ID:
Content-Type: text/plain; charset="i
aft-requ...@mailman.qth.net wrote:
Message: 4
Date: Fri, 10 Dec 2021 13:30:16 +
From: Andy Durbin
To:"elecraft@mailman.qth.net"
Subject: [Elecraft] KAT500 Attenuator
Message-ID:
Content-Type: text/plain; charset="iso-8859-1"
KAT500 has an input attenuator
Guys,
I'm not about to remove all of the cables to look but using my iPhone camera it
looks like I have S/N 1418, which I kit-built.
My R7 is AWOL and R6 measures about 228 Ohm.
Looks like Elecraft needs to explain.
Wes N7WS
On 12/10/2021 8:25 AM, Andy Durbin wrote:
Hi Lyn,
Thanks for
Hi Lyn,
Thanks for your report. Your KAT500 is a later serial than mine so I doubt R7
is fitted. (Mine was a kit build and I don't know if factory units are in the
same serial number series)
I don't know the source of my Rev C schematics. I received some of my
KAT500/KPA500 from Elecraft
n...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Andy Durbin
Sent: Friday, December 10, 2021 7:30 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KAT500 Attenuator
KAT500 has an input attenuator that may, under certain conditions, be
activated during a full search
KAT500 has an input attenuator that may, under certain conditions, be activated
during a full search tune. Page 1 rev C of the KAT500 schematic shows the
attenuator is a divider consisting of R6 and R7 which are both 39 ohm. My
KAT500 serial number 2609 does not have R7 fitted and R7 is
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