[Milsurplus] [Glowbugs] LF & HF Crystal Tester prelim comments

[Al Klase]

OK Guys.

Lets be specific about which tester we're talking about.  Amazon and 
Ebay, I see two different units.

One:  LED display, one connection for xtal, about $10-12.

Two:  LCD display, two connections labeled ">1MHz" and "<1MHZ", about $18,

Glen and Hue, which are you talking about?  I may still design my own.

Al

On 8/23/2019 8:17 PM, Glen Zook via Milsurplus wrote:
> I got one of those crystal testers several months ago.  Instead of the 
> HC-49/U socket I installed one for FT-243 crystals that will work for 
> HC-6/U crystals and for the wire lead types.  I don't have any 
> problems with the unit reading all types of crystals.
>
>
> Glen, K9STH
>
> Website: https://k9sth.net
>
>
> On Friday, August 23, 2019, 04:06:02 PM CDT, Hubert Miller 
> <Kargo_cult at msn.com> wrote:
>
>
> So I bought online for very little money one of those LF, HF crystal 
> testers with readout.
>
> It arrived remarkably quickly. It is quite a small unit and arrives in 
> a little mailing bag. In fact, when I received the bag,
>
> I thought it only would contain a couple transistors I had ordered 
> elsewhere.
>
> The thing is really only intended for tiny crystals with wire leads.
> To test anything else, I think we need to attach the smallest 
> alligator clips to very short leads and wire to the tester's
>
> tiny crystal test socket.
>
> I found:
>
> It does not at all like any test leads to your crystal that are 
> anything long. It will not "read" the crystal.
>
> I think it needs good, strongly active crystals. I seem to recall that 
> some that my dipmeter resonated, when tested on
>
> this machine, did not show anything.
> Maybe it has trouble with crystals with a higher than usual series 
> resistance?
>
> It _did _however measure a couple of those WWII FT-241  LF crystals.
>
> It also proved its worth to me in short order. I had a bunch of 
> crystals marked  453.5 that I bought from some boat – radio
>
> surplus lot. Oh boy, I thought, a bunch of 453.5 kHz rocks I can use 
> either with a mechanical filter or as single – crystal
>
> selectivity near the common IF freq. Well, they all tested on this 
> device as in the 16 MHz range. I don't get the 453.5 marking
>
> and I'm pretty sure they weren't intended for 453.5 MHz use, but I'm 
> not positive. More likely I think they were for 1970s –
>
> 1980s crystal controlled SSB boat radios. Now one less thing to save.
>
> However, the ( gradual ) search for the ideal crystal tester goes on.
>
> -
>
>
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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