I have run an AL-1500 and SB-220 in series. Absolutely do not do
this if the second amp in line is equipped with QSK circuitry,
because RFI from the high level of other-band power may switch
its relay into transmit. As N2BC says, at that point the second
amp is toast.
I have a Ten-Tec Titan 417A that will switch into transmit just
from 20 meter energy coming back down its coax from the antenna.
For example, while the AL-1500 is transmitting on 20, I'll look
over and see idling current on the 417A, because it has switched
itself into transmit. I don't use QSK on either amp. I had to
put a 20 meter reject stub on the 417A to keep it from doing that
evil behavior. Maybe if you flip the manual standby switch into
standby, it won't happen, but you can't be fiddling with that all
the time, and you only have to forget once - then you're cooked.
Dave Hachadorian, K6LL
Big Bear Lake, California
-----Original Message-----
From: Michael Clarson
Sent: Thursday, August 23, 2012 9:23 AM
To: n2bc@stny.rr.com
Cc: amps@contesting.com
Subject: Re: [Amps] Multiple Amplifier Switching Box
N2BC: Not sure I understand why QSK would be an issue -- if your
amp is in
Standby, you should be able to run exciter through it, correct?
You do have
a point -- one needs to make sure IF series amps are tried, that
the bypass
around the amp can handle another amps full power and not just
exciter
power levels. --Mike, WV2ZOW
On Thu, Aug 23, 2012 at 11:40 AM, N2BC <n2bc@stny.rr.com> wrote:
> Amps in series.... not so good. I would guess that most QSK
> amps have a
> form of RF 'sniffer' on the input to prevent hot switching.
>
> Following a massive brain cramp, I cabled a KWS-1 (600W)
> through a TenTec
> Titan. Was a bit confused when smoke started to curl out of
> the Titan & it
> was powered off. Result: charcoal grid circuit.
>
> -----Original Message-----
>
> Tessco ( www.tessco.com ) sells RG-400/U in one foot
> increments. If your
> > amps have built in antenna relays, have you considered
> > hooking your
> > amps in series and just switching the PTT line? --
>
>
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