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[CQ-Contest] Two radios - one amp

Subject: [CQ-Contest] Two radios - one amp
From: wx0b@arraysolutions.com (Jay Terleski)
Date: Wed Jan 17 08:44:30 2001
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Two Radios one amp, or two radios two amps.........this is the question.

I am building a neat system for a gentleman right now that will take two
radios, two amps,(an ACOM and a manual tune amp) and a SixPak.  It will
Swizzle the radio RF outputs or change the two radios into the two amps
inputs and also swizzle the outputs of the amps (5kW rated) to the two
inputs of the SixPak ( we do this so the band data information follows
the correct antenna selection for radio A and radio B).  It will do this
"dual transco function" with a manual switch currently.

The circuitry to do this must keep isolation very high to keep hash and
harmonics down, and it also will manage the PTTs.

One of the benifits of this box is that you can jumper out the second
amp and use only one amp if you had one that was fast enouph.

By using an external recieve loop I think you easily be able to hear on
the "mult" radio while the run radio at the time was transmitting.  Also
using the SO2R box I am coming out with shortly this function becomes
very easy to impliment.

I get many questions daily on the SO2R box status.  So let me take a
little time to say. I just have got the final board in last night and
assembled it. I will post it to the webpage sometime this week.

Metal work will be finished tonight.  Once I get this approved. I will
also post it to the webpage.

So this weekend the Array web site should have the info.  I also have
the list of pre-orders and will send each of you an email directly.


K9TM wrote:
 > ----- Original Message -----
 > From: "Dr. Valeri Stefanov" <wally@el-soft.com>
 > To: <cq-contest@contesting.com>
 > Sent: Tuesday, January 16, 2001 1:57 PM
 > Subject: [CQ-Contest] Two radios - one amp
 >  > ...
 >  > The
 >  > disadvantage of such system is that one can not listen simoultaneously
 >  > on the stand by radio while transmitting on the first radio.
 >  > ...
 >  > 73's de Wally LZ2CJ
 >  >
 > Thus this renders this useless for SO2R as the entire point is to be able to
 > find your next Q while working the current guy (or other variations that
 > involve the use of the other-radio).  This is no more useful than the folks
 > who started the string about using sub-receivers instead of using 2 actual
 > radios (the sub is muted while in xmit).
 > The reality becomes, you need more than one amp (or go low-power and forget
 > the amps).  In simple terms you could drive 1 amp from multiple radios...
 > but to do it at a level to be able to compete is very doubtful.
 > BTW, even the 87A lets you send it commands on the serial port to tell it to
 > tune to a band segment rather than waiting to sample the RF.  There is no
 > special advantage by the ACOM.
 > The other thing I have wrestled with is that everyone I know with 87A's have
 > had problems.  I tend to lean in the direction of 6 seperate multiband amps
 > that can be switched.  This affords the most flexability and one can easily
 > purchase 6 AL1200's for the cost of 2 87A's or 2 Acom's.  Go with used
 > AL1200's or the like and save money.
 > The other thing to consider with the solid state jobs is that I don't think
 > any of them put out 1500 watts like the 87A or Acom or other amps (if you
 > know of one that does, let me know).  Why go to all that expense to get
 > 600-1000 watts out?  The other problem is matching with the solid state
 > amps.  Yeah I know some of them have built-in antenna tuners but there is
 > more delay.  They are quiet though!
 > 73 Tim K9TM

Jay Terleski
WX0B - Array Solutions

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