[K3PZN-List] FD2008 Advanced Planning

Fri Jun 29 16:49:05 EDT 2007

Andy

we did not use any extra bandpass filters (that i know
of) during the contest.  

last i knew the club does have a set of bandpass
filters.  these are designed to reject interference
from radios on a different BAND, saying keeping a 20m
meter SSB signal on 14.200 from interfering with a 40m
CW signal on 7.035.  they are not sharp enough to
prevent interference from two radios in the same band.

what John was asking for, a very very narrow filter
around 20 kHz BW is POSSIBLE, but a bit exotic.  some
new high end rigs have these filters at their first IF
- they are called roofing filters.  finding one at
14.070 for the PSK31 station might be a bit tough. 
and here's another problem - these filters have high
loss and they do not handle high power - so they are
receive only.  

'good' radios have some good filtering to begin with,
but we will still have to work this problem some more
in future events.  when the PSK31 station was well
adjusted, I could work CW most of the time since the
interference was around 2 s-units.  maybe i couldnt
copy the weakest stations calling, but this was
useable.  since we are 'amateurs' we are still
learning - looking forward to working these things
out!

73, curt

--- Andy Leeds <amleeds at peoplepc.com> wrote:

> Question as the new guy - do we have bandpass
> filters? I don't remember any but I only made a
> brief token appearance after the wedding I went to
> so I might not have been paying attention.
> 
> Andy
> -----Original Message-----
> >From: Curt Milton <wb8yyy at yahoo.com>
> >Sent: Jun 29, 2007 8:32 AM
> >To: Carroll County Amateur Radio Club
> <k3pzn-list at mailman.qth.net>
> >Subject: Re: [K3PZN-List] FD2008 Advanced Planning
> >
> >John and the group
> >
> >nice post and good ideas.  i am suspicious we can
> make
> >some reasonable adjustments.  a group in NM (4
> >operators and 2 transmitters) had a phenomenal
> score
> >running QRP - but then I noticed they used some
> >state-of-the-art antennas operating E-class from a
> >home station.  
> >
> >on 20m we can make an effective antenna that is
> around
> >88 feet long and it will work well horizontal ...
> the
> >balloon idea might be worth considering for 80m, if
> >our objective is to put lots of west coast stations
> in
> >the log.  but here in the east, it may not be worth
> >the effort since having a big signal east of the
> >mississippi may be more important.  
> >
> >i merely said fewer nice antennas would be better
> than
> >what we had since every mode would enjoy them, and
> >sharing them may not be so bad.  you might even
> enjoy
> >trying a K2 on PSK31 to enjoy its nicer dynamic
> range!
> > 
> >
> >the 20 foot screwdriver vertical the phone station
> >used was nicely effective !  next year let's work
> >smarter not harder.  and we will 'work' to put more
> of
> >the 'fun' into the event that W3JJH has promoted. 
> >maybe when/if John steps down as FD chairman he can
> be
> >the 'fun' captain. 
> >
> >speaking of antennas ... my shack does not have
> great
> >ones ... this fall i may continue my 80m vertical
> >experiments.  if anyone has unwanted lightweight
> >pieces of aluminium around i could add some to the
> >remnants of a commercial multibander - i am
> >contemplating removing all of its traps and trying
> to
> >add a little stature to it.  right now its merely a
> >perch for bluebirds.  
> >
> >i did make a QSO to VE2 with a TT1340 (same model
> rig
> >N3WM brought to FD.  I tried calling ES1QN with it,
> >but there were others calling so i went QRO and got
> >him then on the first call .... i am enjoying DX on
> >40m CW with the 100w addition to my K2 ... i heard
> >that 6m had a nice opening last nite so give that
> band
> >a try.  
> >
> >73, curt
> >  
> >
> >--- John Hart <john_k3kwo at hotmail.com> wrote:
> >
> >> To all,
> >> 
> >> I fully agree that better antennas (some gain or
> >> more gain) is a better way 
> >> to go than more power at the transmitter. 
> Spreading
> >> out the antennas will 
> >> help with the cross-band and same-band
> interfierence
> >> between stations and 
> >> modes.  From a digital mode standpoint, cutting
> down
> >> on or eliminating the 
> >> blast from other modes would make it alot easlier
> >> and faster to rack up more 
> >> points.  This is especially true when operating
> >> PSK-31 as it is somewhat 
> >> sensitive to getting the waterfall track chopped
> up
> >> by CW or Phone.  During 
> >> FD2007, I moved my Outback Antenna about 40 feet
> >> towards the parking lot and 
> >> grounded it to my truck, this improved my overall
> >> recieve ability to read 
> >> PSK-31 signals over the local CW and Phone RF. 
> My
> >> Outback Antenna may not 
> >> be the best for Field Day, but it was quick to go
> up
> >> and easy to use.  Next 
> >> year, I hope to use something better and located
> >> farther away from other 
> >> antennas.  I'm sure we all can do better if we
> >> spreadout and use the full 
> >> 1000 foot diameter site that is allowed.
> >> 
> >> We need to experiment with some different types
> of
> >> gain antennas and see how 
> >> they would fit in at the FTC (as a location
> >> example).  Are we too close to 
> >> the airport for any balloon supported antennas
> for
> >> HF?
> >> 
> >> The Packet Station was a great idea and I liked
> the
> >> video projector approach 
> >> to allow everyone in the room to see the incoming
> >> messages.
> >> 
> >> Does anyone make any inexpensive narrow (25 to 50
> >> KHZ) bandpass filters that 
> >> we could add outboard to the front of our
> equipment
> >> during Field Day to help 
> >> with the RF overload from band to band.  The
> >> Dunestar devices are OK but I 
> >> understand that they are primarily designed for
> the
> >> transmit side of the 
> >> operation.
> >> 
> >> JUST A THOUGHT OR TWO,
> >> 
> >> John, K3KWO
> >> 
> >> 
> >>
>
>-----------------------------------------------------
> >> BREAK
> >> -----------------------------------------------
> >> Next CCARC meeting Monday July 9, 7:30 PM at the
> >> Emergency Services Training Center in
> Westminster.
> >> 
> >>
>
>-----------------------------------------------------
> >> AR
> -----------------------------------------------
> >> K3PZN-List mailing list supporting the Carroll
> >> County Amateur Radio Club
> >> K3PZN-List at mailman.qth.net
> >>
> http://mailman.qth.net/mailman/listinfo/k3pzn-list
> >> 
> >
> >
> >
> > 
>
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>-----------------------------------------------------
> BREAK
> -----------------------------------------------
> >Next CCARC meeting Monday July 9, 7:30 PM at the
> Emergency Services Training Center in Westminster.
> >
>
>-----------------------------------------------------
> AR -----------------------------------------------
> >K3PZN-List mailing list supporting the Carroll
> County Amateur Radio Club
> >K3PZN-List at mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/k3pzn-list
> 
> 
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-----------------------------------------------------
> BREAK
> -----------------------------------------------
> Next CCARC meeting Monday July 9, 7:30 PM at the
> Emergency Services Training Center in Westminster.
> 
>
-----------------------------------------------------
> AR -----------------------------------------------
> K3PZN-List mailing list supporting the Carroll
> County 
=== message truncated ===

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