[nrv-hams] Pass Band Filters

Fri Dec 2 21:14:35 EST 2011

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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