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@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@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@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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Vasiliy
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