Topband: Topband Digest, Vol 187, Issue 3
Scott Meister
scottmeister at me.com
Wed Jul 4 13:16:25 EDT 2018
my one plug in my officd/livingroom is dead
> On Jul 4, 2018, at 12:00 PM, topband-request at contesting.com wrote:
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> Today's Topics:
>
> 1. Beverage Antenna Tuning (Ashraf Chaabane)
> 2. Re: Beverage Antenna Tuning (Joe Subich, W4TV)
> 3. Re: Beverage Antenna Tuning (pa5mw at home.nl)
> 4. Re: Beverage Antenna Tuning (Ashraf Chaabane)
> 5. Re: Beverage Antenna Tuning (pa5mw at home.nl)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 4 Jul 2018 15:13:27 +0100
> From: Ashraf Chaabane <ash.kf5eyy at gmail.com>
> To: topband at contesting.com
> Subject: Topband: Beverage Antenna Tuning
> Message-ID:
> <CAJkwfxdKYqMtRrMki5uqJ_pP0M0vFbzepBPpYmN0m+yDRz-+Cg at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi All
>
> I measured the SWR in my beverage antenna; the SWR fluctuates between 1.5
> and 3 in a range of 1.8 to 7 MHz. (See:
> https://drive.google.com/drive/folders/0B9AtNpPfAOUMRDNsaXROMG1VUTg?usp=sharing
> )
> I know SWR should not vary too much. However, some people are suggesting
> adjusting the termination resistor. Others suggest checking the transformer
> number of windings for a good match. What shall I do?
>
> 73 Ash 3V8SS/KF5EYY
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 4 Jul 2018 10:18:47 -0400
> From: "Joe Subich, W4TV" <lists at subich.com>
> To: topband at contesting.com
> Subject: Re: Topband: Beverage Antenna Tuning
> Message-ID: <e20391d2-833d-c71b-cf41-126310f00b31 at subich.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
>
>> What shall I do?
>
> Nothing? What you measure should have no practical impact on
> performance.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 2018-07-04 10:13 AM, Ashraf Chaabane wrote:
>> Hi All
>>
>> I measured the SWR in my beverage antenna; the SWR fluctuates between 1.5
>> and 3 in a range of 1.8 to 7 MHz. (See:
>> https://drive.google.com/drive/folders/0B9AtNpPfAOUMRDNsaXROMG1VUTg?usp=sharing
>> )
>> I know SWR should not vary too much. However, some people are suggesting
>> adjusting the termination resistor. Others suggest checking the transformer
>> number of windings for a good match. What shall I do?
>>
>> 73 Ash 3V8SS/KF5EYY
>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 4 Jul 2018 16:23:23 +0200
> From: <pa5mw at home.nl>
> To: "'Ashraf Chaabane'" <ash.kf5eyy at gmail.com>,
> <topband at contesting.com>
> Subject: Re: Topband: Beverage Antenna Tuning
> Message-ID: <001701d413a2$9107e370$b317aa50$@home.nl>
> Content-Type: text/plain; charset="us-ascii"
>
> Based on my field installed beverages experience, I would say this is
> exactly what I always read on my ant analyzer.
> Ground and local air/bush moisture level changes, like after rain or such,
> will affect readings too.
>
> I would do optimization only if this installation was permanent and you have
> the time and tools available.
>
> 73 Mark, PA5MW
>
>
>
> -----Original Message-----
> From: Topband <topband-bounces at contesting.com> On Behalf Of Ashraf Chaabane
> Sent: Wednesday, July 04, 2018 4:13 PM
> To: topband at contesting.com
> Subject: Topband: Beverage Antenna Tuning
>
> Hi All
>
> I measured the SWR in my beverage antenna; the SWR fluctuates between 1.5
> and 3 in a range of 1.8 to 7 MHz. (See:
> https://drive.google.com/drive/folders/0B9AtNpPfAOUMRDNsaXROMG1VUTg?usp=shar
> ing
> )
> I know SWR should not vary too much. However, some people are suggesting
> adjusting the termination resistor. Others suggest checking the transformer
> number of windings for a good match. What shall I do?
>
> 73 Ash 3V8SS/KF5EYY
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 4 Jul 2018 15:39:57 +0100
> From: Ashraf Chaabane <ash.kf5eyy at gmail.com>
> To: pa5mw at home.nl
> Cc: topband at contesting.com
> Subject: Re: Topband: Beverage Antenna Tuning
> Message-ID:
> <CAJkwfxcvV2UkXcs+wtj8hr9PfXyiPwnj86HvoZ0rFKMg-tcjeQ at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Mark,
>
> I'm planning to have the termination value adjustment excercice for F/B
> maximisation using a BC station signal. However, does SWR measurement have
> to do also with the termination value? Or that's rather the matching
> transformer that I should act on?
> I now have an antenna analyzer and multimeter. What kind of optimization I
> can carry out? (The beverage is permanently installed).
>
> 73 Ash
>
> On Wed, Jul 4, 2018 at 3:23 PM <pa5mw at home.nl> wrote:
>
>> Based on my field installed beverages experience, I would say this is
>> exactly what I always read on my ant analyzer.
>> Ground and local air/bush moisture level changes, like after rain or such,
>> will affect readings too.
>>
>> I would do optimization only if this installation was permanent and you
>> have
>> the time and tools available.
>>
>> 73 Mark, PA5MW
>>
>>
>>
>> -----Original Message-----
>> From: Topband <topband-bounces at contesting.com> On Behalf Of Ashraf
>> Chaabane
>> Sent: Wednesday, July 04, 2018 4:13 PM
>> To: topband at contesting.com
>> Subject: Topband: Beverage Antenna Tuning
>>
>> Hi All
>>
>> I measured the SWR in my beverage antenna; the SWR fluctuates between 1.5
>> and 3 in a range of 1.8 to 7 MHz. (See:
>>
>> https://drive.google.com/drive/folders/0B9AtNpPfAOUMRDNsaXROMG1VUTg?usp=shar
>> ing
>> )
>> I know SWR should not vary too much. However, some people are suggesting
>> adjusting the termination resistor. Others suggest checking the transformer
>> number of windings for a good match. What shall I do?
>>
>> 73 Ash 3V8SS/KF5EYY
>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>>
>
> --
> Ash ~ 3V8SS/KF5EYY
> http://www.kf5eyy.info/
> Phone/SMS/Whatsapp: (+216) 22670026
> Skype: kf5eyy
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 4 Jul 2018 17:09:59 +0200
> From: <pa5mw at home.nl>
> To: "'Ashraf Chaabane'" <ash.kf5eyy at gmail.com>
> Cc: <topband at contesting.com>
> Subject: Re: Topband: Beverage Antenna Tuning
> Message-ID: <002b01d413a9$13a44340$3aecc9c0$@home.nl>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Ash,
>
> Some info:
>
> - SWR curve median will always slowly rise.
> No action; this has to do with parameters which slowly affect at higher
> freq.
> That is rather irrelevant on the lowbands 160-80-40
>
> - Termination +matching adjustment is optimal at 'minimal amplitude' of the
> SWR curve
> Meaning; the waves must be 'as small as possible'.
> It might never be flat, I have never ben able to get there. Maybe others can
> give better advice here.
> But does it matter when not SWR 1? No.
>
> - Matching optimal beverage impedance to coax
> Like when all is set optimal but the whole beverage antenna is not 450 Ohms
> but 530 ==> stick with the 9:1
> Or, at a BOG where installation is near ground, impedance is abt 220 Ohms
> ==> stick with 4:1
> A better matching is possible by altering the transformer windings.
> But again, does it matter?
> Can you make more QSO's?
> I have not seen/read any proof on this yet.
>
> Please also note:
>
> Local environment, as well as length/install- height of beverage wire will
> determin the 3D pattern
> Local ground/air humidity will change performance slightly
>
> Adjusting F/B to local BC signal can be distracting because:
> BC freq is out of band and a good F/B at <1600kHz does not mean it is now
> optimal at 1830kHz as well..
> Groundwave BC signals arrive at 0 degrees; you want to adjust FB at incoming
> skywave (10< >50 degrees) signals instead
> What reference you should use depends on your QTH and the first wave of
> incoming (Europe?) QRM
>
> I hope others, with more experience on this subject will have a better
> answer here.
>
> In general, my experience is a beverage antenna will work rather quickly and
> perform well.
> There is just no bad-adjustment possible.
>
> 73 Mark, PA5MW
>
>
>
> -----Original Message-----
> From: Topband <topband-bounces at contesting.com> On Behalf Of Ashraf Chaabane
> Sent: Wednesday, July 04, 2018 4:40 PM
> To: pa5mw at home.nl
> Cc: topband at contesting.com
> Subject: Re: Topband: Beverage Antenna Tuning
>
> Mark,
>
> I'm planning to have the termination value adjustment excercice for F/B
> maximisation using a BC station signal. However, does SWR measurement have
> to do also with the termination value? Or that's rather the matching
> transformer that I should act on?
> I now have an antenna analyzer and multimeter. What kind of optimization I
> can carry out? (The beverage is permanently installed).
>
> 73 Ash
>
> On Wed, Jul 4, 2018 at 3:23 PM <pa5mw at home.nl> wrote:
>
>> Based on my field installed beverages experience, I would say this is
>> exactly what I always read on my ant analyzer.
>> Ground and local air/bush moisture level changes, like after rain or
>> such, will affect readings too.
>>
>> I would do optimization only if this installation was permanent and
>> you have the time and tools available.
>>
>> 73 Mark, PA5MW
>>
>>
>>
>> -----Original Message-----
>> From: Topband <topband-bounces at contesting.com> On Behalf Of Ashraf
>> Chaabane
>> Sent: Wednesday, July 04, 2018 4:13 PM
>> To: topband at contesting.com
>> Subject: Topband: Beverage Antenna Tuning
>>
>> Hi All
>>
>> I measured the SWR in my beverage antenna; the SWR fluctuates between
>> 1.5 and 3 in a range of 1.8 to 7 MHz. (See:
>>
>> https://drive.google.com/drive/folders/0B9AtNpPfAOUMRDNsaXROMG1VUTg?us
>> p=shar
>> ing
>> )
>> I know SWR should not vary too much. However, some people are
>> suggesting adjusting the termination resistor. Others suggest checking
>> the transformer number of windings for a good match. What shall I do?
>>
>> 73 Ash 3V8SS/KF5EYY
>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>>
>
> --
> Ash ~ 3V8SS/KF5EYY
> http://www.kf5eyy.info/
> Phone/SMS/Whatsapp: (+216) 22670026
> Skype: kf5eyy
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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> ------------------------------
>
> End of Topband Digest, Vol 187, Issue 3
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