[Amps] hot keying the amp?

[Jim W7RY]

Agreed.
73
Jim W7RY


-----Original Message----- 
From: Joe Subich, W4TV
Sent: Wednesday, February 13, 2013 11:45 AM
To: amps at contesting.com
Subject: Re: [Amps] hot keying the amp?


> With good speed on the amplifier relays, (3 ms) there is really no
> reason to use key in an key out. Most rigs are 5-10 ms after the
> amplifier switching relay energizes till RF starts out the stack.

Except, of course, for the Icom rigs that are still making RF 3 or 4 ms
*AFTER* the HSEND line goes high!  See data by both W0QE and AD5X.

73,

    ... Joe, W4TV


On 2/11/2013 11:10 PM, Jim W7RY wrote:
> With todays modern transceivers, there is really no reason to use key in 
> and key out. I have measured the RF vs. amplifier keying line, (both relay 
> and solid state amplifier PTT) on lot of rigs. With good speed on the 
> amplifier relays, (3 ms) there is really no reason to use key in an key 
> out. Most rigs are 5-10 ms after the amplifier switching relay energizes 
> till RF starts out the stack.
>
> 73
> Jim W7RY
>
>
>
>
> From: Vasiliy Gokoyev
> Sent: Monday, February 11, 2013 7:14 PM
> To: Jim W7RY
> Cc: amps at contesting.com
> Subject: Re: [Amps] hot keying the amp?
>
> Hi Jim
>
> Yes, your SB-200 QSK board is next as soon as I fix this LK500 :) (got the 
> mouser parts today).
>
> LK500 has a key-in and key-out on the QSK board.  So the amp keys the 
> transceiver after it thinks it's ready.  An interesting solution.  There 
> is a 555 timer that supposed to hold off the relays for an additional 11ms 
> after the the key (or PTT) goes back to high. But this is not happening, 
> the amp turns off immediatedly as the PTT goes high, while the radio 
> (kenwood ts-590) continues to transmit for another 4-5 ms.  Trying to 
> figure out what's wrong with the 555 circuit...  May be it's the caps like 
> Carl and others suggested
>
>
> On Mon, Feb 11, 2013 at 8:44 PM, Jim W7RY <w7ry at centurytel.net> wrote:
>
>    Take a look here on how to measure QSK circuits and your radio:
>
>    http://www.w0qe.com/amplifier_timing.html
>
>    You need to measure the radio and the amplifier response. What radio 
> are you using?  Have you measured the relay speed in the amplifier?
>
>    Email me privately if you wish to discuss further.
>
>    73
>    Jim W7RY
>
> 
> http://www.ebay.com/sch/radioamplifiers/m.html?item=281051269896&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562
>
>
>
>
>    -----Original Message----- From: Vasiliy - K3IT
>    Sent: Sunday, February 10, 2013 8:38 PM
>    To: amps at contesting.com
>
>    Subject: [Amps] hot keying the amp?
>
>
>    the new amp LK500ZB and I continue our bonding process :)
>
>    I've wired up the QSK circuit and recorded the CW signal on my scope. 
> I
>    can see a small bump after each dot and dash, like on the picture here
>    http://goo.gl/74HO3
>    Does it look like hot keying the amp?   There is also a very sharp fall 
> off
>    - the dot is supposed to be 87ms but cut off early.  Is anybody 
> familiar
>    with the QSK circuit on LZ500ZB and/or have words of wisdom? I wonder 
> if
>    the QSK circuit has been played with and I can't operate it like this.
>    (I'm really knew to "QRO" stuff).
>
>    73
>
>    P.S. Thanks to all for answers regarding the LK500Z output on 10m. 
> I've
>    been testing and re-testing and now consistently get good power on all
>    bands.
>
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>
>
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