Scott,
Sorry I misread your question. Yes the side protruding is kind-of
square which makes it a flat side. The remainder of the body is round.
You apparently have them mounted correctly.
73,
Don w3FPR
On 12/24/2012 12:31 PM, Scott Krebs wrote:
Don,
These are definitely not the blue-bodied trim caps. I'm familiar with those as
they are used in the KFL1-4, which I've already assembled. No confusion at all
as to how to orient the blue-bodied, angular-nosed trim caps.
The C13/20 trim caps I've now installed on my RF board appear to have a white,
cylindrical, possibly ceramic body. There are no flat sides on the main body.
Underneath the slotted adjusting screw is what appears to be a fiber washer,
half brown and half white, with a small blob of what appears to be solder
applied between the side of the adjusting screw and white half of the washer.
One electrical connector is attached to the back side of the cylindrical body
while the other electrical connector is attached to the square protrusion from
the other side of the cylindrical body.
The assumption I made during installation was to match the asymmetrical side
(i.e., square protrusion) of the trim cap with the flat side marked on the PCB.
Scott
On Dec 24, 2012, at 10:34 AM, Don Wilhelm <[email protected]> wrote:
Scott,
I figure you have the blue bodied trimmers and not the older ceramic ones.
Look at them carefully - one end is rounded (that will be the wider end with
rounded corners) while the 'shorter' end has angular corners and a flat between
those corners. That is the 'flat' side and should be aligned to the flat shown
in the manual. Be aware that the newer gold looking solder pads do not accept
silkscreening, so you must align them like is shown in the manual.
The consequence of mounting them backwards is that you will have to use an
insulated tool to adjust them.
Does that clear up your confusion?
73,
Don W3FPR
On 12/24/2012 9:14 AM, Scott Krebs wrote:
My K1 RF board ceramic trimmer capacitors C13 and C20 have an outline shape
that differs from either that described in the K1 assembly instructions or on
the silkscreen outline on the RF board PCB. This is the same question that Dean
asked back on 10/27/12. Don's answer described trimmer capacitors with an
angular shape. This description perfectly describes the trimmer capacitors on
the KFL1-4 filter board (e.g., figure 1 in KFL1-4 assembly instructions) but
does not appear to describe the current crop of RF board trimmer caps. I didn't
see any additional clarification associated with that thread.
The K1 assembly manual (p. 28) describes C13/20 trimmer caps that "have one side
that is flattened." The trimmer caps supplied with my K1 have a round profile with a
square protrusion on one side of the profile, sort of like the profile of an old-style
keyhole. I'm assuming that the square protrusion side of the trimmer cap equates to the
flattened side of the PCB outline (i.e., square protrusion pointing to the rear of the
PCB) and have installed my trimmer caps based on this assumption. Is this assumption
correct?
As long as I'm pounding away on the keyboard, here's one other question. The K1 "DC
voltage check" procedure on p. 30 calls for a power supply voltage of 12-14 VDC.
However, my trusty old late-70s-vintage Vanco regulated DC power supply has an unloaded
DC voltage of 14.5 VDC as measured with a Fluke 115. I also note that the K1
specifications on p. 5 lists a required supply voltage of 8.5-15 VDC. I also suspect that
once placed under load, my Vanco PS will drop to something less than 14 VDC. Is it OK to
use this power supply for the DC voltage check procedure?
Scott
N4KTR
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