Interesting thread. I suspect that the topic is simpler than people might
want it to be. When I started to use the Flex3000 with a rather heavily
used SB200 some three years ago I wondered about the possibility of mixing
tube and solid-state voltages and was told to "not worry about it." But
being a conservative person I bought a "Sunlight" isolation relay box (no
longer available), never adjusted anything and have never had any problems.
But then I've long felt that people tend to be overly cautious which can
lead to wanting to be "taken care of."
73
Lee K9WRU
----- Original Message -----
From: "Jim Barber" <audio...@q.com>
Cc: <flexradio@flex-radio.biz>
Sent: Sunday, September 01, 2013 10:14 PM
Subject: Re: [Flexradio] TXOut Delay.
50ms is probably around the minimum for an SB-200.
It all depends on the relay(s). In the case of the SB-200 it's an old
open-frame type, very slow. Amps advertised for "QSK" use often have
vacuum relays, which can switch many times faster.
If you're running SSB, keep in mind that hotswitching the antenna contacts
is the major issue, but not the only one. Some amp designs (not the
SB-200) have a separate relay for the tube bias, which is often buffered
with a simple R/C network. The point is that you shouldn't put drive on
the tube(s) before the operating bias has had time to switch from cut-off
to operate. In the case of the SB-220 for example, the cutoff bias is set
to a unnecessarily high voltage as a matter of convenience, which makes
the situation worse.
My .02,
Jim N7CXI
On 9/1/2013 8:22 PM, Steve Sterling wrote:
Steven-- I was kinda waiting to see what others thought, but haven't seen
any response in 24+ hours.
I have mine set at 50ms. That's a pretty reasonable time for power and
antenna relays to pull in and get seated.
I originally started at 100ms, but the delay was noticable-- not long,
but you could kinda tell it was there. I can't tell 50ms at all, except a
little on CW. I start getting faults in my amp with less than 20-25ms of
transmit delay on 80 and 40 meters. 20 meters I could set it at 0ms and
it never faults. Go figure.
Steve WA7DUH
On 8/31/2013 7:52 AM, Steven Hess wrote:
I've got a SB 200 with a interface for proper keying from a modern rig
to
the relay installed.
What should I set the TXOut delay for to make sure the relays are
properly
closed before I pass RF to the amplifier? I've got it set for 7 In the
General Options tab of PowerSDR right now.
Steven
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