The part number for the bare KFL1-4 board is E100129 as listed in the
KFL1-4 manual.
I do not know whether Elecraft has any boards in stock, but one could
ask. Good luck with your project(s).
You would also need the firmware E610010 as well as the other parts such
as relays, connectors, crystals etc. If you downloaded the KFL1-4
manual before it was removed, you are 'in luck'.
73,
Don W3FPR
On 3/6/2015 10:03 PM, Dr. William J. Schmidt, II wrote:
There is probably some middle ground here to satisfy most people in this
situation. It's completely understandable and correct that Elecraft would
not want to spend the effort to re-engineer this board. However some of us
on channel don't see the task as rocket science and in most cases would be
glad to provide that expertise as a side effort just to make that equipment
useful. If Elecraft had even something as simple as unpopulated boards to
purchase for use as prototypes, it would make that task quite simple.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
Owner - Operator
Big Signal Ranch - K9ZC
Staunton, Illinois
Owner - Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
email: b...@wjschmidt.com
-----Original Message-----
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don
Wilhelm
Sent: Friday, March 06, 2015 8:05 PM
To: Ross Primrose; Phil Wheeler; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K-1 4-band Availability/Status?
Ross,
That vital part is the availability of the 1 to 40pF trimmer capacitors
- which also had a very tight temperature compensation characteristic.
The KFL1-4 used 16 of them.
Due to their wide capacity range, the same capacitors could be used in
all 16 positions and provide successful tuning.
Those capacitors have been discontinued by the manufacturer.
The problem is that there are no substitutes that could be used for all
16 positions, and it would take a great deal of engineering effort to
determine the suitable substitutes for each position on the 4 band
board. In other words, would a 3 to 15pf trimmer be suitable in the C1
thru C4 locations and would a 12 to 30pF trimmer be suitable in the C5
thru C8 locations and so forth. Furthermore, if the 17 meter band were
chosen instead of the 15 meter band, which low range trimmer capacitors
would be used for each band.
I am speaking of examples for the engineering effort that would be
required to select the best capacitor for each position and each band
choice. It is not a trivial exercise.
I certainly would not want to do experiments to select the appropriate
replacement trimmers necessary to resurrect the 4 band board, and I am
certain the engineering staff does not have the time to do that work.
The documentation would get more complicated as well - for example, "if
you have chosen the 15 meter band, use the red trimmer capacitors at
location Cx but if you have chosen 17 meters, use the yellow trimmers at
those locations"
Hopefully you get the point of the complexity created by those wide
range trimmer being no longer available. The values I have proposed
above are only numbers off the top of my head for examples, they have no
value in the real world.
73,
Don W3FPR
On 3/6/2015 6:46 PM, Ross Primrose wrote:
Looking at the parts list, I can't imagine which part is no longer
available....
73, Ross N4RP
On 3/6/2015 4:37 PM, Phil Wheeler wrote:
Confirm. Something related to a vital part(s?) no longer being
available.
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