[nrv-hams] Pass Band Filters

Thu Dec 8 18:46:23 EST 2011

 Thanks for the cold update Carter, Please don't STRAIN you voice on
tonights net.
You"must" be better by Saturdays breakfast, *OK!*
73,
Pete

On Thu, Dec 8, 2011 at 3:05 PM, Carter Craigie <carter128 at verizon.net>wrote:

> Thanks, Pete!
>
> I will want to say something about these dates on tonight's net, I hope,
> that is, if I can work up enough VOICE to make a transmission. This cold is
> getting better, but it isn't gone away completely yet!
> 73,
> Carter
>
> -----Original Message-----
> From: nrv-hams-bounces at mailman.qth.net
> [mailto:nrv-hams-bounces at mailman.qth.net] On Behalf Of Pete Burkey
> Sent: Friday, December 02, 2011 9:15 PM
> To: NRV-Hams: A mailing list for members of the New River Valley (VA)
> Amateur Radio Club.
> Subject: Re: [nrv-hams] Pass Band Filters
>
> Carter,
>
> Dec 17,  Dec31, Jan 7,14,21,and 28 will work for me.
>
> Pete   (W3WEQ)
>
> On Fri, Dec 2, 2011 at 12:10 PM, John C Lawson <narzonian at gmail.com>
> wrote:
>
> > December is pretty busy but I see nothing in my Saturdays in January,
> YET.
> > John C
> >
> > On Thu, Dec 1, 2011 at 4:40 PM, Carter Craigie <carter128 at verizon.net>
> > wrote:
> > > Hi fellow NRV ARC members,
> > >
> > > At last Monday evening's club meeting I introduced, as new business,
> > > a
> > plan
> > > for our club to become involved in making 4 pass band filters,
> > > expressly intended to alleviate the interference such as we had at
> > > last year at
> > Field
> > > Day (FD). The CW station got into the SSB stations, and vice-versa.
> > > We
> > spent
> > > a fair amount of operating time trying to reduce the interference,
> > > and
> > were
> > > only somewhat successful. So we're thinking about FD 2012 already!
> > > Read
> > on.
> > >
> > > Donnie Coleman, AB4I, has a solution, one that has worked in years
> past:
> > > something called bandpass filters. Basically speaking, if an op is
> > > on 80 meters CW, he/she won't even hear the other transmitters (SSB,
> > > CW, or
> > DATA)
> > > that are simultaneously operating on any of the other bands.  It
> > > would be like that CW station were the only one there at FD!  And
> > > the same would
> > be
> > > true for the other station(s)  as well: the SSB operators would not
> > > hear
> > the
> > > CW station on the air, unless then switched to the same band with
> > > the CW station.
> > >
> > > This sounds like a really good idea to me, especially as I learned
> > > that
> > the
> > > club has used a very similar bandpass filter model before, many
> > > years
> > ago,
> > > and it worked.
> > >
> > > The idea would be to have club members build four (4) of these
> > > filters,
> > so
> > > that, at some time in the future, we might want to go from Class 3A
> > > to
> > Class
> > > 4A, meaning we'd be having 4 stations running on the air at the same
> > > time--with no interference from each other, so long as we stay on 4
> > > different meter bands. This sounds pretty good to me, and it did to
> > > all
> > the
> > > members who were at Monday's meeting.
> > >
> > > At the meeting, Donnie spoke about the project, and passed around a
> > sample
> > > of what one of the filters would look like. This was a prototype he
> > > had built, and was done using something called "ugly construction,"
> > > but it
> > was
> > > enough for all of us to see the ten (10) toroids, each wound with
> > variations
> > > of 1, 2, 3, or 4 windings of wire.
> > >
> > > We could also see the capacitors in place, already soldered to the
> > > PC
> > board
> > > that Donnie has made, with a rotary switch to select the band.
> > > Indeed, he will make and donate all four of the PC boards and all of
> > > the wire needed to do the winding of the 40 toroids--ten per each
> > > bandpass filter.
> > >
> > > Kay and I have already purchased the various parts. So there would
> > > be no expense to the club, and the treasury won't be hit up for any
> > > costs. What WILL be expected, though, is for enough of us club
> > > members to come to the Dublin Fire House on a Saturday morning to do
> > > the toroid winding and the capacitor soldering, and the kit assembling.
> > >
> > > This should be a real learning experience for us--and a lot of fun
> > > as
> > well.
> > > The winding is not too hard to do, and once you've done one, you'll
> > > be champing at the bit to do more.
> > >
> > > Everybody at the club meeting expressed an interest in getting
> > > involved,
> > and
> > > that was most heartening! The immediate problem will be finding the
> > date(s)
> > > that enough of us can come to do the work. John C Lawson KJ4NGC
> > > assures
> > me
> > > that, given a two-week warning, the Fire Department would allow us
> > > to do
> > the
> > > work there, especially if we could come in the morning. By the way,
> > there is
> > > a second-floor meeting room there as well as the one we were in on
> > > Monday night, so he thinks the chances are very good that we could
> > > get a
> > Saturday
> > > morning of our choice.
> > >
> > > I have volunteered to be the one who finds a date which is suitable
> > > for
> > most
> > > of us. This will require some action and commitment from each of you
> > > who wants to be involved in this project. We will first start to ask
> > > you to check your calendars for the months of December and January.
> > >
> > > Check with the important people in your life to see if you can spend
> > > some quality time starting on a Saturday morning during this 2-month
> period.
> > >
> > > Then email me (carter128 at verizon.net) the Saturdays in that time
> > > frame
> > that
> > > you positively can NOT attend.  I will take an accounting, and try
> > > to
> > find
> > > THE Saturday that MOST of us CAN make it. I realize that some people
> > > have obligations they cannot skip, so there will be no hard feelings
> > > if you
> > can't
> > > make the first meeting, as there will probably be one or two more
> > > get-togethers before the project is successfully completed. We ought
> > > to
> > be
> > > able to find some way you can be involved in this project--and we
> > > want
> > you
> > > ALL to take part, if you possibly can.
> > >
> > > Donnie says that he has access to some sophisticated equipment where
> > > he works, and he has volunteered to do the final tweaking of the
> > > filters for us, and we thank you for that Donnie.
> > >
> > > So, let's get started by sending to me an email with all the
> > > Saturdays
> > that
> > > you absolutely, positively CANNOT attend the first construction
> > > meeting
> > at
> > > the Dublin Fire House. I work best by using a deadline, so let's say
> > > to write me back by Saturday, December 10th at 12:00 Noon. I hope
> > > that will give everybody time enough to look over their calendars,
> > > to check with church and work and home obligations, to check with
> > > bosses and managers and/or spouses and significant others.
> > >
> > > I will get back to everybody on Sunday, December 11th, on the Sunday
> > night
> > > net at 8:00 PM on the 147.180 repeater. (And if my signal is bad, I
> > > will email everybody the following day!)
> > >
> > > I hope you all will respond as soon as you can. I promise you that
> > > this
> > will
> > > be fun, and educational as well!!!
> > >
> > > 73,
> > >
> > > Carter N3AO
> > >
> > > ______________________________________________________________
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> >
> >
> > --
> > John C
> > ______________________________________________________________
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