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K3 keying Alpha 374A/76A

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K3 keying Alpha 374A/76A

Out of an overabundance of caution I thought I'd ask first....

My manuals for my old Alphas suggest the amplifier keying line is 20
something volts DC +, and the K3 manual says I can key way more than that + DC.

So I just wanted to confirm (or learn more):

1) I shouldn't worry about any kind of an outboard relay system, and

2) was curious if there is any other advice re delay settings etc. when
using the K3 with old Alphas like the 374A and 76A.

Thanks for any thoughts.

Scott ka9p
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Don Wilhelm-4

Re: K3 keying Alpha 374A/76A

Scott,

The K3 KEYOUT can handle up to 200 volts as long as it is a positive
voltage. So +20 volts is no problem.

I cannot comment on the delay settings, I don't have an Alpha amp.

73,
Don W3FPR

On 11/3/2015 9:51 AM, Scott via Elecraft wrote:

> Out of an overabundance of caution I thought I'd ask first....
>
> My manuals for my old Alphas suggest the amplifier keying line is 20
> something volts DC +, and the K3 manual says I can key way more than that + DC.
>
> So I just wanted to confirm (or learn more):
>
> 1) I shouldn't worry about any kind of an outboard relay system, and
>
> 2) was curious if there is any other advice re delay settings etc. when
> using the K3 with old Alphas like the 374A and 76A.
>
>

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Elliott Lawrence-5

Re: K3 keying Alpha 374A/76A

I use the default setting TX Dly 008 with my 87A with no problem. I would think that it would work fine also with the contempory 76s etc.
73
Elliott WA6TLA

On Nov 3, 2015, at 11:26 AM, Don Wilhelm <[hidden email]> wrote:

> Scott,
>
> The K3 KEYOUT can handle up to 200 volts as long as it is a positive voltage. So +20 volts is no problem.
>
> I cannot comment on the delay settings, I don't have an Alpha amp.
>
> 73,
> Don W3FPR
>
> On 11/3/2015 9:51 AM, Scott via Elecraft wrote:
>> Out of an overabundance of caution I thought I'd ask first....
>> My manuals for my old Alphas suggest the amplifier keying line is 20
>> something volts DC +, and the K3 manual says I can key way more than that + DC.
>> So I just wanted to confirm (or learn more):
>> 1) I shouldn't worry about any kind of an outboard relay system, and
>> 2) was curious if there is any other advice re delay settings etc. when
>> using the K3 with old Alphas like the 374A and 76A.
>>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

Jim Brown-10

Re: K3 keying Alpha 374A/76A

On Tue,11/3/2015 11:48 AM, Elliott Lawrence wrote:
> I use the default setting TX Dly 008 with my 87A with no problem. I would think that it would work fine also with the contempory 76s etc.

It works fine with my Ten Tec Titan 425s, which are early '80s vintage,
and use a vacuum relay for antenna switching. That relay is the
limitation; slower relays will require a longer delay.

73, Jim K9YC
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Bob K6UJ

Re: K3 keying Alpha 374A/76A

In reply to this post by Elliott Lawrence-5

I use an Alpha 76PA with my K3 and no problems.

73,
Bob
K6uj

On 11/3/15 11:48 AM, Elliott Lawrence wrote:

> I use the default setting TX Dly 008 with my 87A with no problem. I would think that it would work fine also with the contempory 76s etc.
> 73
> Elliott WA6TLA
>
>
> On Nov 3, 2015, at 11:26 AM, Don Wilhelm <[hidden email]> wrote:
>
>> Scott,
>>
>> The K3 KEYOUT can handle up to 200 volts as long as it is a positive voltage. So +20 volts is no problem.
>>
>> I cannot comment on the delay settings, I don't have an Alpha amp.
>>
>> 73,
>> Don W3FPR
>>
>> On 11/3/2015 9:51 AM, Scott via Elecraft wrote:
>>> Out of an overabundance of caution I thought I'd ask first....
>>> My manuals for my old Alphas suggest the amplifier keying line is 20
>>> something volts DC +, and the K3 manual says I can key way more than that + DC.
>>> So I just wanted to confirm (or learn more):
>>> 1) I shouldn't worry about any kind of an outboard relay system, and
>>> 2) was curious if there is any other advice re delay settings etc. when
>>> using the K3 with old Alphas like the 374A and 76A.
>>>
>> ______________________________________________________________
>> 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
>> Message delivered to [hidden email]
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

Elecraft mailing list

Re: K3 keying Alpha 374A/76A

In reply to this post by Elecraft mailing list

Thanks everyone, seems to be working great at 008 here. On to the next
problem :) 73 Scott

In a message dated 11/3/2015 2:05:57 P.M. Central Standard Time,
[hidden email] writes:

On Tue,11/3/2015 11:48 AM, Elliott Lawrence wrote:
> I use the default setting TX Dly 008 with my 87A with no problem. I
would think that it would work fine also with the contempory 76s etc.

It works fine with my Ten Tec Titan 425s, which are early '80s vintage,
and use a vacuum relay for antenna switching. That relay is the
limitation; slower relays will require a longer delay.

73, Jim K9YC
______________________________________________________________
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