[Elecraft] Using A 6 Meter LNA & Amplifier with the K3S

[John Stengrevics]

Hi John,

Aha!  I see that now.  OK, I will follow the instruction in Fred’s book to set this.

Thanks & 73,

John
WA1EAZ

> On Sep 23, 2018, at 11:53 AM, John Simmons <jasimmons at pinewooddata.com> wrote:
> 
> I think it is called TX DELAY. I know the setting is in there.
> 
> -John NI0K
> 
> John Stengrevics wrote on 9/23/2018 10:29 AM:
>> Hi Don,
>> 
>> That was timely as I just got off Skype with Jim, W6PQL.  He mentioned that the ALC should be held high for some milliseconds to allow for the amp’s relays to switch over thereby protecting the LNA.
>> 
>> Since the K3S works differently than most, he suggested that I look for an RF Hold-Off setting on the K3S and set it for around 50 milliseconds.  That being said, I don’t see that in the manual or in Fred’s book.  Any suggestions?
>> 
>> 73,
>> 
>> John
>> WA1EAZ
>> 
>>> On Sep 23, 2018, at 11:12 AM, Don Wilhelm <donwilh at embarqmail.com> wrote:
>>> 
>>> John,
>>> 
>>> I do not understand how the amplifier or the ALC could protect the LNA.
>>> I assume the LNA is only used on receive, so if you have good sequencing between receive and transmit, no damage could occur.
>>> ALC is only applicable to transmit, and Elecraft does not recommend using ALC to limit the drive to the amplifier.  Set the power to the amp properly and all will be well.
>>> Using ALC to control the exciter power is a bad way to do things, it will only lead to distortion and spurious emissions from the amplifier.
>>> 
>>> 73,
>>> Don W3FPR
>>> 
>>> On 9/23/2018 10:58 AM, John Stengrevics wrote:
>>>> My apologies - I should have added that I am using a Downeast Microwave DTR relay to take the LNA out of the line when voltage applied to the relay drops as a result of transmission.
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