[nrv-hams] Pass Band Filters

Thu Dec 8 15:05:39 EST 2011

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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