[CQ-Contest] 419 band pass filters..... can a heverivier duty coilbe installed ??

[Keith Dutson]

My 419A's are rated at 200 watts.

During a DXpedition to VP8 (Falklands), the 10M section acted up (VSWR went
to 5) when a tuner was placed between it and a vertical antenna with high
VSWR.  At the time I thought the unit might be bad so swapped it with
another 419A from the second radio running a different band.  After a short
period of time it too went to high VSWR.  Later, back at home, I contacted
ICE and they sent replacement caps for the 10M section for both units.

I decided to beef up the 10M section in one of the units by doubling the cap
voltage ratings through use of multiple caps.  This did not work.  I could
not get the bandpass frequency to adjust properly for 10M.  Probably just
too much stray capacitance in the circuit.  So, it is back to stock
configuration.

These units have now been used on two more DXpeditions (9H3DX and VU7RG)
without a problem.

73, Keith NM5G

-----Original Message-----
From: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com] On Behalf Of Steve Lott
Sent: Sunday, March 18, 2007 10:59 AM
To: CQ-Contest at contesting.com
Subject: [CQ-Contest] 419 band pass filters..... can a heverivier duty
coilbe installed ??

while we are on this topic.......

is there a method of installing beefer colils ect indide the unit to
accomodate a 200 watt xcvr ???

steve

ref...

wrote:
>
> This is a common symptom of a damaged filter section, typically a mica 
> cap that has been over heated and shifted significantly in 
> capacitance.  Very easy to replace the cap(s) yourself or send back to ICE
for repair.
>
> 73,
> Ed - W0YK
>
>
> > Subject: [CQ-Contest] ICE 419 Bandpass filters
> >
> > I have a unit that keeps failing on 20 meters.  Not sure why.
> >  I also noticed that my FT-2000 will not put out the same amount of 
> > power while the
> > 419 is in the line with a 1:1 swr.  Anyone else seen this?
> > Not sure why that would happen either.
> >
> > I guess I will send the bad unit back for repairs.
> >
> > Mike W0MU
> >



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