Nothing to level. It's not a contest :-) 74
Tom W7WHY
On Jul 5, 2017 11:07 AM, "Russ Dearmore via TowerTalk" <
towertalk@contesting.com> wrote:
> I was wondering if in the past FD was regulated to only wire antennas.
> It would seem to be a way to level the playing field for all participants
> and add a stealthy aspect to the weekend. There's something about aluminum
> beams and even verticals that seem a bit out of place when considering that
> we are practicing for dire emergency situations. Although I don't see us
> being invaded anytime soon (Hi) the added consideration would give a bit
> more meaning to the exercise... Possibly an additional weekend contest
> with these points emphasized or additional points awarded in some manner to
> the existing field day. (I haven't read all the rules on FD so please
> forgive me if those rules already exist). By the way I'm not suggesting
> that anyone is doing anything improper by using aluminum. A fun sprint
> type contest would be to use battery powered radios like military models
> until all batteries expired. Just some ideas to challenge us to improve
> our sport... Russ K5ZZR
>
>
>
> From: "towertalk-request@contesting.com" <
> towertalk-request@contesting.com>
> To: towertalk@contesting.com
> Sent: Tuesday, July 4, 2017 11:01 AM
> Subject: TowerTalk Digest, Vol 175, Issue 10
>
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> Today's Topics:
>
> 1. Re: Field Day (Kim Elmore)
> 2. Re: Field Day (Ed Sawyer)
> 3. Re: Field Day (Kim Elmore)
> At our club we make certain that our dipoles are strung end-to-end at
> nearly the same height. We also make liberal use of common mode chokes
> on both ends the the transmission lines for each station. This seems to
> work for us relatively well as we can usually operate phone and CW on
> the same band without much, if any, interference. I always run CW and I
> sometimes hear some trash form the phone station. This year we traced it
> down to a philosophy of "all knobs to the right" on the phone
> transmitter (an IC-7300). I was using my Kenwood TS-930S with the INRAD
> roofing filter in the 40 MHz IF. With that mod, it has become a pretty
> stout receiver, on par with my Orion II ( which I've had to FD in the
> past) if the signals are ~100 kHz apart. More separation would always
> help, but we'd still strive to keep the dipoles end-to end and at nearly
> the same height.
>
> Kim Elmore N5OP
>
> On 7/3/2017 11:13 AM, Jim Thomson wrote:
> > Date: Mon, 3 Jul 2017 06:52:42 -0700
> > From: Grant Saviers <grants2@pacbell.net>
> > To: "towertalk@contesting.com" <towertalk@contesting.com>
> > Subject: Re: [TowerTalk] Field Day
> >
> > <We (N7KE) haven't had the lack of interference others note re same band
> > <operation on FD. So am looking for ideas about what to chase or
> improve.
> >
> > <Operating 2A on two separate generators - Honda inverter 1000EU, no
> > <interconnections of stations
> >
> > We experience lot's of buzz from cw into ssb, need to get as far up the
> > band as possible. Reverse also true. About the same level of trouble
> > as last year with the beams 75' closer together.
> >
> > Tried a new vertical 40m dipole this year on ssb and noticed less
> > problems, which was expected with the crossed polarization.
> >
> >
> > Any designs for 100w same band filters appreciated.
> >
> > Grant KZ1W
> >
> > ## band pass filters, each being 7000-7300, probably are not going to
> do much good,
> > if 2 x xcvrs used on the same band, say 40m cw..and 40m ssb. Heres a
> thought though.
> > I see ICE and others make band pass filters for the warc bands, like 100
> khz wide for 17+12M,
> > and only 50 khz wide for 30M band. If they can make a 50 khz wide
> band pass filter for 30M
> > band, they, or somebody should be able to make any BW filter you want.
> IE: say 7000-7050,
> > or 7000-7075 for 40m CW.... then perhaps 7100-7300 for 40m ssb, or
> perhaps 7150-7300,etc.
> >
> > ## Or perhaps an LP filter for 40m CW..with a sharp cut off at
> whatever upper freq u want, like perhaps
> > 7050, 7070, etc. Then say a HP filter, again with a sharp cut off,
> for 40M ssb, like 7100 khz.
> >
> > ## 6 or 8 pole xtal filters, custom made, might be of some benefit...on
> RX only. Same deal, like 7000-7070
> > etc, for cw....and something similar for 40m SSB. But if the 40m SSB
> station has broadband TX IMD,
> > the CW station will still RX the imd, but less of it.
> >
> > ## I believe a band pass filter is just a combo LP + HP filter in
> series. Perhaps a bandpass filter for 40M
> > cw use, but with a sharper cut off for the LP filter portion. And a
> band pass filter for 40M SSB, but with a
> > sharper cut off for the HP filter portion. Band pass filters that
> would handle 100-200 w, with the above
> > narrow widths, might well chop off some of the broad band trash, hash,
> buzz, imd,clicks, etc on TX.
> >
> > ## A stand alone, tunable high Q RX pre-selector might be of some
> benefit. The TX imd on ssb, with the K3
> > running 100w out, will not be wonderful on the CW stations K3...on RX.
> This is where you want real low TX
> > IMD...on ssb....and no clix at all on cw.
> >
> > Jim VE7RF
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
> --
>
> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
> SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>
> /"In theory there is no difference between theory and practice. But, in
> practice, there is." //– Attributed to many people; it’s so true that it
> doesn’t matter who said it./
>
>
> I have done quite a bit of "in band" low power 2 radio work. At 100 W, 2
> A4
> tribanders, tip to tip, 225ft separation should have still audible sounds
> on the cross band portion CW vs SSB - maybe 2 - 3 S units. However 10 -
> 15dB of attenuation on the receivers should kill it if it becomes
> bothersome. If you are not seeing that, consider grounding the systems
> together and trying other radios (making sure the SSB radio is not over
> driving).
>
>
>
> I have cross polarized 10, 15, 20M systems that are separated by 200 - 400
> feet and they are virtually silent on the noise floor 25khz away - same
> mode
> band - using 100W. Using amps, you can hear them but the 15dB of pad kills
> it.
>
>
>
> On 40 - 160, try running a long - directional beverage, separated and to
> the
> side of the antenna if you have the room. At 100W, and with the improved
> S/N ratio, you should do really well. Potentially both stations could use
> the same beverage for receive.
>
>
>
> Ed N1UR
>
>
>
> 'Zactly. The value of 10-15 dB of attenuation can work wonders.
>
> Kim N5OP
>
>
> On 7/4/2017 5:48 AM, Ed Sawyer wrote:
> > I have done quite a bit of "in band" low power 2 radio work. At 100 W,
> 2 A4
> > tribanders, tip to tip, 225ft separation should have still audible
> sounds
> > on the cross band portion CW vs SSB - maybe 2 - 3 S units. However 10 -
> > 15dB of attenuation on the receivers should kill it if it becomes
> > bothersome. If you are not seeing that, consider grounding the systems
> > together and trying other radios (making sure the SSB radio is not over
> > driving).
> >
> >
> >
> > I have cross polarized 10, 15, 20M systems that are separated by 200 -
> 400
> > feet and they are virtually silent on the noise floor 25khz away - same
> mode
> > band - using 100W. Using amps, you can hear them but the 15dB of pad
> kills
> > it.
> >
> >
> >
> > On 40 - 160, try running a long - directional beverage, separated and to
> the
> > side of the antenna if you have the room. At 100W, and with the improved
> > S/N ratio, you should do really well. Potentially both stations could
> use
> > the same beverage for receive.
> >
> >
> >
> > Ed N1UR
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
> --
>
> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
> SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>
> /"In theory there is no difference between theory and practice. But, in
> practice, there is." //– Attributed to many people; it’s so true that it
> doesn’t matter who said it./
>
>
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