[CW] CW Digest, Vol 111, Issue 18

Tue Jul 30 19:42:43 EDT 2013

The good news here in the US is that there are very few TV transmitters 
on channel 2 now days.

Tim
KE4KE

On 07/30/2013 06:14 PM, co8ly wrote:
> During years I have tried to eliminate the ITV in the channel 2 TV
> when I transmit in 6 mtrs and it is impossible.
> Low pass filters that solves the problem doesn't exist.
>
> I wish you good luck.
>
> Strong hug 73
> Eduardo CO8LY
>
> ----- Original Message -----
> From: <cw-request at mailman.qth.net>
> To: <cw at mailman.qth.net>
> Sent: Tuesday, July 30, 2013 1:08 AM
> Subject: CW Digest, Vol 111, Issue 18
>
>
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>
> Today's Topics:
>
>     1. My low pass filter works (Hans Brakob)
>     2. Re: My low pass filter works (D.J.J. Ring, Jr.)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 29 Jul 2013 21:41:21 -0700 (PDT)
> From: "Hans Brakob" <kzerohb at gmail.com>
> To: "CW Reflector" <cw at mailman.qth.net>
> Subject: [CW] My low pass filter works
> Message-ID: <1375159280557.87f1c2aa at Nodemailer>
> Content-Type: text/plain; charset="utf-8"
>
> Did you ever have one of those days that you thought maybe you ought to
> check to see if your Novice license was still valid?
>
>
>
>
>
>
> Couple years ago K0CKB gifted me a modern Yaesu FTdx-5000 radio which
> includes all those new WARC bands, and even 6 meters.
>
>
>
>
>
>
> Well I finally got curious to see what lay behind that "50" band-button, and
> having no antenna, I cut and bent and soldered up a bunch of copper water
> pipe into a reasonable facsimile of a 6-meter J-Pole last week.
>
>
>
>
>
>
> Put it up in the air, ran some fresh coax to the shack, and hooked it to a
> vacant connector on my antenna switch box.
>
>
>
>
>
>
> Mashed in the "50" button on the rig, tuned around, and the band seemed
> empty.??Checked the SWR at 50.010 --- infinity.??Checked SWR at the top of
> the band and spots between --- infinity at all those spots too!??Checked all
> my construction dimensions, ohmed out the new coax, tried several
> adjustments to the J-pole feed point looking for a match.??NOTHING.
>
>
>
>
>
>
> So this evening I borrowed an antenna analyzer from N0AT.
>
>
>
>
>
>
> Unhooked the coax from the switch box, attached the analyzer, fired it up,
> and found a nice 1:1 match at 52.873 mHz, and under 2.5:1 across the band.
>
>
>
>
>
>
> WTF!?!?
>
>
>
>
>
>
> Hooked the coax back to the switch box and checked the SWR at the
> radio.??Infinite mismatch across the band.
>
>
>
>
>
>
> WTF!?!?
>
>
>
>
>
>
> Clambering around under the desk looking for a bad patch cord (or
> something), I came face to face with......
>
>
>
>
>
>
> .....the low pass filter (50 mHz cutoff) that I installed way-back-when to
> protect TV channel 2 in the neighborhood.??On the input line to my antenna
> switch box!
>
>
>
>
>
>
> Sunnuvagun!??See the subject line.
>
>
>
>
>
>
> de Hans, K(n)0HB
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> ------------------------------
>
> Message: 2
> Date: Tue, 30 Jul 2013 01:08:26 -0400
> From: "D.J.J. Ring, Jr." <n1ea at arrl.net>
> To: CW Reflector <cw at mailman.qth.net>
> Subject: Re: [CW] My low pass filter works
> Message-ID:
> <CADO5RbigiMy9JmrrcfSGCmdSj4pa01eR8J1wth9Dm1ntOVWSKQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> My low pass is a 54 MHz cutoff.  You could have purchased the 34 MHz
> version as 50 MHz cutoff does nothing for you.
>
> When you took it out did it work?
>
> David
> On Jul 30, 2013 12:41 AM, "Hans Brakob" <kzerohb at gmail.com> wrote:
>
>> Did you ever have one of those days that you thought maybe you ought to
>> check to see if your Novice license was still valid?
>>
>>
>>
>>
>> Couple years ago K0CKB gifted me a modern Yaesu FTdx-5000 radio which
>> includes all those new WARC bands, and even 6 meters.
>>
>>
>>
>>
>> Well I finally got curious to see what lay behind that "50" band-button,
>> and having no antenna, I cut and bent and soldered up a bunch of copper
>> water pipe into a reasonable facsimile of a 6-meter J-Pole last week.
>>
>>
>>
>>
>> Put it up in the air, ran some fresh coax to the shack, and hooked it to a
>> vacant connector on my antenna switch box.
>>
>>
>>
>>
>> Mashed in the "50" button on the rig, tuned around, and the band seemed
>> empty.  Checked the SWR at 50.010 --- infinity.  Checked SWR at the top
>> of the band and spots between --- infinity at all those spots too!
>> Checked
>> all my construction dimensions, ohmed out the new coax, tried several
>> adjustments to the J-pole feed point looking for a match.  NOTHING.
>>
>>
>>
>>
>> So this evening I borrowed an antenna analyzer from N0AT.
>>
>>
>>
>>
>> Unhooked the coax from the switch box, attached the analyzer, fired it up,
>> and found a nice 1:1 match at 52.873 mHz, and under 2.5:1 across the band.
>>
>>
>>
>>
>> WTF!?!?
>>
>>
>>
>>
>> Hooked the coax back to the switch box and checked the SWR at the radio.
>> Infinite
>> mismatch across the band.
>>
>>
>>
>>
>> WTF!?!?
>>
>>
>>
>>
>> Clambering around under the desk looking for a bad patch cord (or
>> something), I came face to face with......
>>
>>
>>
>>
>> .....the low pass filter (50 mHz cutoff) that I installed way-back-when to
>> protect TV channel 2 in the neighborhood.  On the input line to my
>> antenna switch box!
>>
>>
>>
>>
>> Sunnuvagun!  See the subject line.
>>
>>
>>
>>
>> de Hans, K(n)0HB
>>
>> ______________________________________________________________
>> CW mailing list
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>>
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>> Please help support this email list: http://www.qsl.net/donate.html
>>
>> =30=
>>
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>
> End of CW Digest, Vol 111, Issue 18
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