K2

[kf7gc]

Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without hurting it? 
 

73! Tomy Ivan KF7GC
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[ny4g]

It is much easier to do with a K2 /100 dialed back to 5 watts of drive

Ariel NY4G

Sent from my iPhone

On Oct 2, 2013, at 6:35 PM, "Tomy" <[hidden email]> wrote:

> Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without hurting it?
>  
>
> 73! Tomy Ivan KF7GC
> ______________________________________________________________
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[Don Wilhelm-4]

Tomy,

The K2/10 will have to be equipped with an amplifier keying circuit.
The keying circuits that have been publicized will handle a positive
keying voltage.  Check the specs for the AL80B to see if the PTT voltage
is positive or negative.
If it is negative, you will have to add a keying relay between the K2
Amp Keying Circuit and the Amplifier.

If you already have the amplifier, you can check the PTT keying voltage
with your DMM.  Connect the DMM to the PTT input of the amplifier - the
DMM will show you the keying voltage and the polarity.  Then set the DMM
to read current, and connect the leads between the amp PTT input and
amplifier ground - the amp should key and the DMM should indicate the
current required by the amp's PTT input.

Prepare your K2 amp keying circuit according to those measurements.

73,
Don W3FPR

On 10/2/2013 6:34 PM, Tomy wrote:
> Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without hurting it?
>  
>
> 73! Tomy Ivan KF7GC
>

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[RobertG]

I'm sure Don Wilhelm can give the best answer to this one. The K2 puts
out 10ish watts max, so the output of the amp will be limited by this
drive level. Most amps - I'm not an expert at this - require a bit more
drive to get them to their ultimate capacity, so the K2 may under-drive
the amp in question. A more irksome problem will probably be how to
manage T-R switching in the amp. The K2 doesn't have a port to connect
to an amp T-R line. With the K100 amp installed in the K2, there is a
line for T-R amp switching. Also, the K100 will no doubt be able to
drive the amp to its full rating. I used the K2 w/ amp to drive a 500w
tube amp without any problems. That I know. With the K100, the K2 covers
everything from micro power up to the standard 100w in a very small,
high performance package. When I got my K3 I sure hung on to my K2/100.
Buying a Ferrari is no reason to sell the MG. Good luck.

...robert

On 10/2/2013 22:48, Ariel Jacala wrote:

> It is much easier to do with a K2 /100 dialed back to 5 watts of drive
>
> Ariel NY4G
>
> Sent from my iPhone
>
> On Oct 2, 2013, at 6:35 PM, "Tomy" <[hidden email]> wrote:
>
>> Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without hurting it?
>>
>>
>> 73! Tomy Ivan KF7GC
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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[Vic Rosenthal]

Here is a circuit for an amp key circuit that can be added to the K2:

<http://www.elecraft.com/Apps/Amp_keying_ckt.htm>

The stock AL80B has a low-voltage positive key line. Just to be sure -- perhaps it's been
modified -- it's a good idea to measure it before connecting it.

You will get a couple of hundred watts from the AL80B depending on the band.

On 10/2/2013 3:34 PM, Tomy wrote:
> Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without hurting it?

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Sverre Holm (LA3ZA)]

There is an improved keying circuit which can be found here http://la3za.blogspot.co.uk/p/la3za-unofficial-guide-to-elecraft-k2_28.html by searching for "WA5PB/N0SS". It was offered as a kit, but isn't any longer since N0SS is SK.

Vic K2VCO-2 wrote

Here is a circuit for an amp key circuit that can be added to the K2:

<http://www.elecraft.com/Apps/Amp_keying_ckt.htm>