Topband: More Inv-L matching issues.... BIGGER ISSUE

Paul Dulaff pdulaff at embarqmail.com
Sat Dec 31 17:21:44 PST 2011


Dan

A couple of thoughts...

When transmitting, is the RCS-10 antenna switch inadvertantly changing (switching) antennas (ports) during the transition from receive to transmit, possibly RF getting into the switching circuit causing this ? Do you lose the 12VDC to the switch when changing from receive to transmit ?  Are you trying to support semi-break-in with the RCS-10 ?

The ratings on this switch are fairly good. 16 amps, 1200 volts. I would think that it would need to be feeding an open or a short to fail this quickly at this power level or switching at full power.

Paul - WB2NMI


----- Original Message -----
From: Dan Bookwalter <n8dcj at yahoo.com>
To: topband at contesting.com
Sent: Sat, 31 Dec 2011 17:34:09 -0500 (EST)
Subject: Topband:  More Inv-L matching issues.... BIGGER ISSUE

Ok...

I went and added 9 more radials the SWR is now at 1.2:1 after some adjusting of the air variable....

well , i decided to see how the amp (Alpha 374A) loaded into the antenna , I keyed down with maybe 500 watts and everything went dead again in less that 1 second. So it now appears that I have smoked another relay in the RCS-10 .

One thing about this configuration is that the base of the antenna is about 16" from the RCS-10 , is this too close ? I can probably move it so that it is about 4' away if that is the issue.... I cant afford to keep destroying relays and such....

thoughts ?

Dan N8DCJ


________________________________
 
-----Original Message-----
From: topband-bounces at contesting.com [mailto:topband-bounces at contesting.com]
On Behalf Of Dan Bookwalter
Sent: Saturday, December 31, 2011 2:41 PM
To: topband at contesting.com
Subject: Topband: More Inv-L matching issues....

well about a month ago i put up my Inv-L , it is now ~165ft , I have an air
variable in series , and 12 radials anywhere from 150-250ft long ( going out
to add more as soon as i am done typing this). my SWR wasn't too bad maybe
1.7:1 at the best. Two nights ago I added an amplifier to the mix ~700w ,
well to make a long story short I smoked one of the relays in my RCS-10 , I
am now not too sure what to do , I don't want to keep blowing out relays in
the RCS-10.

I had several responses back then regarding matching etc... , but , in my
haste i seem to have deleted them :-( 

so here i am again asking for advice...

any help greatly appreciated 

Dan N8DCJ
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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UR RST IS ... ... ..9 QSB QSB - hw? BK



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