(Add shipping costs to all prices unless stated)
Can I TRUST AF4K? Read what others have said here.
This is older, used electronic equipment that may have seen many owners.
It works now, and it should not arrive DOA. And as such, no guarantee is
either expressed or implied. So don't infer one. Sold "as-is." I will insure
against loss in transit. If equipment fails to arrive a claim will be filed.
ALL SALES ARE FINAL. I DO NOT OFFER REFUNDS. Make sure you are getting what you want
BEFORE you agree to buy. Please ask questions and look at the pictures if you are uncertain.
All equipment leaves here as described and is packed very well.
NOTE! Please DO NOT SEND LETTERS OR PACKAGES BY EXPRESS MAIL OR ANY OTHER METHOD THAT REQUIRES A SIGNATURE! I CANNOT AND WILL NOT ACCEPT SUCH LETTERS OR PACKAGES (Trip to Post Office is 30 minutes each way & wait in line 20 mins.)
MORE RADIO ACCESSORIES - CLICK HERE!
Here is a dual in-line package crystal oscillator that will generate RF on popular frequency
of 3.686 MHz in the 80m amateur band. Add your 5 volt DC supply at about 20-50 mA, a key and
an anetnna and you will be on the air with QRPp power and absolute minimum parts count!
Construction plans are available on line... see below.
Crystal stability means you will have no drift, chirp or yoop with this tiny silver rig.
Even use it as a driver for a more powerful RF final. Strictly speaking, you should add
a PI network or other matching circuit between the output pin and antenna for correct
antenna matching and to attenuate the harmonics, but I doubt that you would cause much QRM
with this multi-milliwatter package. Has approx. 10 to 20 mW output. Add a few parts like the one
shown above (Jersey Fireball, kit no longer offered) and you will have a fine little QRP rig.
You will not be the first to have made real CW contacts with a few milliwatts of power!
An experimenter's delight for the ham bands with four pins - ground, +5V and output etc.
PIN CONNECTIONS:
#1 No Connection
#7 Case Ground
#8 Output
#14 + 5 Volts supply
Dimensions in mm:
Plenty available now for $1.00 each or TEN for just $6.00 plus shipping!
N.B. This is just for the oscillator parts - the other parts, case etc. are up to you.
SCHEMATICS:
Here is a little Beacon transmitter using a similar 4-pin oscillator.
Here is a similar 160m design with a push-pull RF
final that could easily be adapted.
5 Watt version - similarly adapting the TTL signal from NAND gates with added boots.
Here is the JERSEY FIREBALL - a multiband TTL oscillator rig with a nice matching circuit you can copy, as shown above.
MANY HAM FT243 CRYSTALS for sale!
Many Variable Capacitors for sale!MORE RADIO ACCESSORIES - CLICK HERE!
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Can I TRUST AF4K? Read what others have said here.
73 from Brian ((( Amateur Radio G3XLQ / AF4K )))
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