but
gave good control.
73
David
G3UNA
- Original Message -
From: Don Wilhelm w3...@embarqmail.com
To: elecraft@mailman.qth.net
Sent: Thursday, February 12, 2009 4:00 PM
Subject: Re: [Elecraft] K3 external qro keying line
Terry,
For those who prefer not to touch the K3
: Thursday, February 12, 2009 4:00 PM
Subject: Re: [Elecraft] K3 external qro keying line
Terry,
For those who prefer not to touch the K3 with a soldering iron, an
external 12 volt relay is a good solution. Obtain the power from the
K3 12VDC OUT jack and use KEYOUT to key the relay
: Don Wilhelm w3...@embarqmail.com
To: David Cutter d.cut...@ntlworld.com
Cc: elecraft@mailman.qth.net
Sent: Sunday, February 15, 2009 1:37 PM
Subject: Re: [Elecraft] K3 external qro keying line
David,
The back emf pulse from a relay occurs when the coil circuit is opened,
and its polarity
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tom Hammond
Sent: 12 February 2009 17:19
To: Lee Buller; Elecraft Reflector
Subject: Re: [Elecraft] K3 external qro keying line
The K3's T-R line output (KEY OUT) can switch up
: [Elecraft] K3 external qro keying line
I can see reason for confusion here - the K3 Manual on page 17 describes
the
amplifier T-R relay keying output
Maybe the wording could be clarified. I would certainly form a (incorrect)
picture in my mind of a small power relay, for which + or -ve
Guy,
I do not understand your confusion. The statement is that KEYOUT can
key up to +200VDC @ 5A. It does not matter whether there is a relay in
the K3 or not (it actually is a HEXFET), that statement specifies the
limits that the circuit in the K3 can handle.
The path will be a closed
I'm a long time builder/operator of an early K2 (s/n 377) and have
considered going for the K3/10.
I would use my SB220 occasionally for more power since I can get approx.
200 watts with 12 watts in.
The question I have is there a PA key line available from the basic K3?
Or, is that
Barry,
The key out line on the K3 on not on a sub assembly, it is on the main RF board.
Im not sure of the relay on the SB220 but I suspect you may need to use one of
those AmpKeyer interfaces that the HeathGuy or Ameritron sells just to be
safe...or
brew your own. It depends on the voltage
: Greg - AB7R a...@cablespeed.com
To: elecraft@mailman.qth.net, 'ba...@mailman.qth.net, Stephen'
pbsba...@buffalo.edu
Sent: Thursday, February 12, 2009 10:18:50 AM GMT -05:00 US/Canada Eastern
Subject: Re: [Elecraft] K3 external qro keying line
Barry, The key out line on the K3 on not on a sub
Terry,
For those who prefer not to touch the K3 with a soldering iron, an
external 12 volt relay is a good solution. Obtain the power from the
K3 12VDC OUT jack and use KEYOUT to key the relay. It accomplishes
the same thing and retains the ability to use QSK in the future without
Unless you are running QSK and need instant keying, I would suggest adding a
small 12v relay inside the K3 that the solid state device keys and presents
the user with a set of dry, isolated contacts that can handle positive,
negative and up to 250v DC or AC.
And bring 250VAC into the case
H I thought the transistor on the K3 doing the switching is pretty
tough. I guess we are talking about older amps and not the ones that use 12
volts to switch.
I have done the following to Radio Shack sells a 5v reed relay that is
pretty darn fast and has good specs. I just
There are solid-state relays in a DIP-6 or a SOP-4 package that can fit most
places and are fast. Check out the NEC PS7113 or PS7141, and similar
devices.
73, doug
X_CMAE_Category: 0,0 Undefined,Undefined
Date: Thu, 12 Feb 2009 11:00:27 -0500
From: Don Wilhelm w3...@embarqmail.com
The K3's T-R line output (KEY OUT) can switch up to 200VDC @ 5A... so it will
easily switch the +120VDC @ 15-30mA from the SB-220.
However, it will NOT SWITCH a NEGATIVE T-R line voltage UNDER ANY
CIRCUMSTANCES!
Users with amps which offer a negative T-R line control voltage will have to
provide
14 matches
Mail list logo
