[ARC5] Fw: ARC-5 Crystal Question
Henry Mei'l's
meils at get2net.dk
Mon Aug 16 02:53:49 EDT 2010
Dennis
I agree about preferring a fixed cap. Naturally, the variable cap should be
physically small and after the best value is found,
the variable could/should be replaced with an equivalent fixed cap.
Henry, Cph.
----- Original Message -----
From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
To: "Discussion of AN/ARC-5 military radio equipment."
<arc5 at mailman.qth.net>
Cc: <jfor at quik.com>
Sent: Monday, August 16, 2010 8:12 AM
Subject: Re: [ARC5] Fw: ARC-5 Crystal Question
> You could use an adjustable cap as long as it was small enough to not have
> significant stray cap. I would prefer a small fixed cap.
>
> Dennis AE6C
>
> On Sun, Aug 15, 2010 at 10:25 PM, Henry Mei'l's <meils at get2net.dk> wrote:
>
>> John and Dennis,
>>
>> Why not use an adjustable capacitor for coupling cap.C for minimum but
>> usable coupling?.
>>
>> Henry, Cph.
>>
>> ----- Original Message -----
>> From: "J. Forster" <jfor at quik.com>
>> To: "Dennis Monticelli" <dennis.monticelli at gmail.com>
>> Cc: "Discussion of AN/ARC-5 military radio equipment."
>> <arc5 at mailman.qth.net>
>> Sent: Monday, August 16, 2010 6:14 AM
>> Subject: Re: [ARC5] Fw: ARC-5 Crystal Question
>>
>>
>> >I found out today, VNAs and crystal coupling are discussed in several
>> > issues of QEX.
>> >
>> > Does anybody have web access to them?
>> >
>> > -John
>> >
>> > ===================
>> >
>> >
>> >> John,
>> >>
>> >> The less capacitance the better, limited only by the sensitivity of
>> >> the
>> >> instrument. I have not tried an actual characterization with a
>> >> network
>> >> analyzer. Certainly seems plausible. I wonder if there are any tips
>> out
>> >> there on the best way to do it. Perhaps an Agilent app note?
>> >>
>> >> Dennis AE6C
>> >>
>> >> On Sat, Aug 14, 2010 at 1:02 PM, J. Forster <jfor at quik.com> wrote:
>> >>
>> >>> This is what I was suggesting:
>> >>>
>> >>> ---------------o
>> >>> VNA ------------------||--=-|
>> >>> ---------------o ===
>> >>> | === Crystal
>> >>> |--------|
>> >>>
>> >>> I've not thought about the coupling C size. It might need to be
>> >>> smaller
>> >>> then 32 pF.
>> >>>
>> >>> -John
>> >>>
>> >>> ==============
>> >>>
>> >>>
>> >>> > John, I understand better now what you were proposing. The other
>> >>> fellow
>> >>> > was proposing working with the blank and you were proposing going
>> >>> through
>> >>> > the holder.
>> >>> >
>> >>> > Dennis AE6C
>> >>> >
>> >>> > On Sat, Aug 14, 2010 at 6:37 AM, J. Forster <jfor at quik.com> wrote:
>> >>> >
>> >>> >> OK. I was just planning to take a coax from the VNA to a small
>> series
>> >>> >> cap
>> >>> >> (about 32 pF) and the other side of the C to GND via the crystal.
>> >>> >>
>> >>> >> -John
>> >>> >>
>> >>> >> ============
>> >>> >>
>> >>> >>
>> >>> >> > Let us know how effectively you can excite a blank using these
>> >>> >> proposed
>> >>> >> > methods. There needs to be a fair amount of coupling to the Z
>> axis
>> >>> of
>> >>> >> the
>> >>> >> > AT cut. The FT-243 and CR-1 holders applied voltage across a
>> >>> narrow
>> >>> >> air
>> >>> >> > gap
>> >>> >> > (capacitance) to both sides of the blank while holding
>> >>> >> > everything
>> >>> in
>> >>> >> > position with corner pressure points (where there is the least
>> >>> >> dampening
>> >>> >> > of
>> >>> >> > vibration).
>> >>> >> >
>> >>> >> > Dennis AE6C
>> >>> >> >
>> >>> >> > On Fri, Aug 13, 2010 at 7:22 PM, J. Forster <jfor at quik.com>
>> wrote:
>> >>> >> >
>> >>> >> >> Interesting idea, I was actually thinking of hooking the
>> >>> >> >> crystal
>> >>> to a
>> >>> >> >> modern Vector Netrwork Analyzer with a small cap.
>> >>> >> >>
>> >>> >> >> Best,
>> >>> >> >>
>> >>> >> >> -John
>> >>> >> >>
>> >>> >> >> ==============
>> >>> >> >>
>> >>> >> >>
>> >>> >> >> >
>> >>> >> >> > On Aug 13, 2010, at 10:55 AM, Henry Mei'l's wrote:
>> >>> >> >> >
>> >>> >> >> >> Will just mention that I also have used several GDOs
>> >>> >> >> >> (Millen, Eico, HB ...) to check xtals- you just bring leads
>> >>> from
>> >>> >> the
>> >>> >> >> >> xtal
>> >>> >> >> >> pins into the GDO's coil socket -
>> >>> >> >> >
>> >>> >> >> > AND, if you have only the crystal blank - the raw quartz
>> >>> >> >> > plate
>> -
>> >>> >> you
>> >>> >> >> > balance the plate on top of the dipper coil, or lean it
>> >>> >> >> > agains
>> >>> the
>> >>> >> >> > side of the coil and tune away. You are likely to get a nice
>> dip
>> >>> at
>> >>> >> >> > the resonant frequency of the plate.
>> >>> >> >> >
>> >>> >> >> > Roy
>> >>> >> >> >
>> >>> >> >> > Roy Morgan
>> >>> >> >> > k1lky at earthlink.net
>> >>> >> >> > K1LKY Since 1958 - Keep 'em Glowing!
>> >>> >> >> >
>> >>> >> >> >
>> >>> >> >> >
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