On 9/23/2018 11:46 PM, Edward R Cole wrote:
Since this is for 6m which kind of considered VHF, then use of a
sequencer should be considered.
By definition, 6M is VHF, which is defined as 30-300 MHz.
The need TX delay/sequencing is related to relay switching times, NOT
operating frequency.
Thanks Ed, I have Jim’s control board in the amp. Just trying to figure out
the connections.
John
WA1EAZ
> On Sep 24, 2018, at 2:46 AM, Edward R Cole wrote:
>
> Since this is for 6m which kind of considered VHF, then use of a sequencer
> should be considered. With either K3 or K3S the last
Since this is for 6m which kind of considered VHF, then use of a
sequencer should be considered. With either K3 or K3S the last stage
of the sequencer can control TX INHIBIT control line of the K3/K3S
which will delay RF output into the PA until after LNA and TR relay
switching has occurred.
Hi John,
The acc cable is used to convey the control signal from the sequencer to
the K3 so that the TX INH will inhibit the K3 when configured correctly
and can be used whether or not the band is built in or not. It may be
possible to use the ALC output from the sequencer dependent upon its
On 9/23/2018 1:35 PM, ANDY DURBIN wrote:
The KPA500 doesn't work that way so I'd be surprised if the KPA1500 did.
Some amps have more protection than others. Some have none. :)
73, Jim K9YC
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On 9/23/2018 8:12 AM, Don Wilhelm wrote:
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.
RIGHT! The ONLY good use of ALC between rig and amp is to protect the
amp from a failure in the antenna system.
Hi Don,
Ordinarily, the W6PQL amp’s control board does this via ALC on the exciter.
But, since that is not an option with the K3S, setting TX DELAY on the K3S to
20 milliseconds should do the trick. That is what Jim, W6PQL, suggested I do.
I have been using the W6PQL amp with the K3S without
John,
There is TX Inhibit that will prevent RF from the K3 until that signal
is dropped.
Of course, it requires a signal from the amplifier or sequencer to
indicate that it is ready for RF.
Trying to use ALC for that purpose is not a good idea.
Does the amplifier control the high on ALC, or
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 wrote:
>
> I think it is called TX DELAY. I know the setting is in there.
>
> -John NI0K
>
> John Stengrevics wrote on
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
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
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
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.
73,
John
WA1EAZ
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