Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Neil -
I'm guessing that Dale's kit is using the 2N7000 as the output device.
They are rated at 70 V Drain-Source, Minimum 60 VDC. Most Drake
transmitters have between 55 - 65V on the key leads, so those 7000's are
living dangerously! :-) I think the last ones I bought cost me around
$0.06 each, so not a disaster if one does go. On the other hand, it
takes so little current to key the transmitter that it might not blow
the junction even if it did break down!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
neil wrote:
neil <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Just tagging on...
I've been very satisfied with a tiny PIC-based keyer from n0xas. He
sells the kits on eBay ("PicoKeyer") for about $18 including a battery.
For $2 more get the optional speed-control pot. It has four memories,
but only supports one "play" button, so memory one is fine, but it's not
too convenient to use messages 2 through 4; you have to hold the play
button down longer to access the additional memories beyond the first
one.
It uses dual MOSFET's for keying, so will work with + or - voltages up
to 60 v. It seems to key my T4XC alright, and the coin-sized battery is
still usable after over a year!
In fairness, I've also had good success with another PIC-based keyer,
from k1el (K-one-EL) - it makes it easier to access up to four memorized
messages with a separate button for each memory, but the speed control
is less convenient than n0xas's unit (doesn't support a pot, so speed is
only adjustable via the built-in menu system).
Either one will fit into an Altoids tin, with room left for most of the
altoids!
Neil
KX2Y
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