[Boatanchors] 1650 KHz crystal

[David Stinson]

----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo at gmail.com>
Subject: Re: [Boatanchors] 1650 KHz crystal


>A digi key search resulted in 18,000 "programmable oscillators" 
>and a
> lot of surface mount modules and solid state E.E. mumbo jumbo.
>
> But since ICM is gone now, it might be nice to know exactly 
> which one
> of these 18 thousand you purchase and how do you put it into an 
> old
> vacuum tube circuit.
>
> Also how you program it.

Here are excerpts from the information that was posted
on the ARC-5 list.

I've used them in many places with good success.
Often use one of those 75-cent DC-DC buck
converters to supply them from either A+ or
rectified filament power.
Used these from Digikey for most projects:
https://support.epson.biz/td/api/doc_check.php?dl=brief_SG-8002CE&lang=en

My SCR-274N VHF
receiver listens to local aircraft traffic whenever
I'm in the falling-down cluttered barn corner I use
to melt solder.
All four channels are little prog-osc boards.
https://goo.gl/photos/sLrArQsPWhKAa2rY9

A sweet little Forest Service radio needed a receive
crystal I didn't have, so a four-pin osc. went into
an FT-243 case.
https://goo.gl/photos/MPsSKcsyxaGKanHH8

Couldn't find the right crystals for two Receiver
channels in a BC-669 so:
https://goo.gl/photos/ZmW8RzHFivg9jCAe8
https://goo.gl/photos/w1sDWCQHZb7D7S8UA

Was also missing one for a Transmit channel
and it needed more "umph" than receive, so:
https://goo.gl/photos/W2CMTu8AjU4nGcsv7
https://goo.gl/photos/rjpQA8EPXxMkgKkw9
---------------------------------------
> Please clarify : the freq must be in MHZ ok but is it only even
> MHZ that is available i.e. 1mhz 2mhz etc..I take it if you want
> 1415khz (for an ARC bfo e.g) you cannot get it by ordering
> 1.415 MHZ or can you?..

Yes, you can get the Epson SG-8002DC and DB
programmed within 10 Hz from 1 to 125 MHz.
---------------------------------------
(Bob, W9RAN:)
http://www.rantechnology.com/four-channel-oscillator-board.html

I've got a limited number of kits available for the price of $18 
each,
postpaid in the US. If you're interested in one, please drop me a
private email and I will provide details. Note this is for the
four-channel board only; you must order the oscillators directly 
from
DigiKey (current price is $4.10 each, qty 1-10, specify desired
frequency in MHz in "Order Notes").

 DigiKey's people must enter the
frquency in MHz, so if you give them KHz, it requires them to 
delay your order while they call or email you for correction.

Thus, if you want 1415 KHz, simply specify the frequency as 1.415
Mhz. For 6800 KHz, specify it as 6.8 MHz, etc. Since the lowest
frequency available with these parts is 1.0 MHz, if you wanted 
something
like a .455 KHz signal for a BFO, you might buy an oscillator 
programmed
for 4.55 MHz and divide the output by 10, or as in one little 
radio I
recently did, use a frequency in the 2.275 MHz range and divide 
by 5,
since the old reliable 7490 decade counter contains a divide by 5
counter. Lots of ways to go, but you'll need to wire up the 
external
circuitry needed and be mindful of spurs or harmonics that may 
result.
(you can also us a 4060 chip and divide by 16 or 32, Dave S.)
It's no problem to specify frequencies to 100 Hz precision needed 
to
generate an on-frequency SSB signal for example. Just be certain 
of
what you give them because these devices are not returnable after 
they
are programmed.

73, Bob W9RAN
----------------------------

GL OM ES 73 DE Dave AB5S