Message-ID: <50905171.9040506@iup.uni-heidelberg.de>
Date: Tue, 30 Oct 2012 23:15:13 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Antenna tuner
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Steinar,

Instead of a HF SWR meter i vote for building a simple RF amperemeter.=20
Resonance <=3D> peak current  (except you're using a class E PA). Works o=
n=20
LF and MF!

73, Stefan


Am 30.10.2012 22:27, schrieb Graham:
> Depends on how  much  power  you  are  going to  use  .....  50 / 70 =20
> watts , you  can  get  away  with  a  big  version  of  a  top  band =20
> tuner  , parallel  tapped   tuner  .....over  this  voltage  /=20
> flashover  becomes  a problem for  a  end  fed  Ae  , I use a  top =20
> loading  coil,  seems to  keep the  atu  voltage  down ..
>
> Over  that  , you  need  to use a  auto  transformer  and  series =20
> variable inductance , luckily  most  normal  HF swr meters  read  at =20
> 500  , which makes  tuning  a lot  simpler ........but  if  you =20
> cannot  reach  1:1  , you  could have  harmonics  , the  swr  meter  ,=20
> showing the  reflected harmonics   from  the  Ae  load   ..
>
> A good  reason to  use  a  wide band   swr  metering system ... band =20
> only ones  will  miss out of  band  harmonics
>
> At  gb4fpr  , feeding  200/300  watts  in to  the  600  ft  delta=20
> loop, there  is  very  little  voltage  in the  tuner
>
> 73 -G.
>
> --------------------------------------------------
> From: "Steinar Aanesland" <saanes@broadpark.no>
> Sent: Tuesday, October 30, 2012 9:03 PM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: Re: LF: Antenna tuner
>
>> Hi, thanks for the feedbacks from both of you .
>>
>>
>> "Why using such a big monster tuner? Because it is commercial?" Hehe,
>> absolutely not Stefan :) but a ham friend of my gave it to me when he
>> heard about my 600m transverter project. I will probably take it a par=
t
>> an use it for other antenna projects.
>>
>> I am now planing to make my own variometer, just for the fun of it. I =
am
>> a novice you know , and I have to take the small steps to learn. I cam=
e
>> across this page describing in easy terms how to make a variometer,
>> http://www.giangrandi.ch/electronics/shortanttuner/shortanttuner.shtml=
 .
>> It seems not be too difficult :)
>>
>> LA5VNA Steinar
>> loc:JO59jq
>> Mal and spam filtering: STRONG
>> www.opera.no
>>
>>
>>
>>
>> Den 30.10.2012 21:37, skrev Stefan Sch=E4fer:
>>> Steinar,
>>>
>>> Graham is right, the coil may be to small for a small amateur antenna.
>>>
>>> Why using such a big monster tuner? Because it is commercial?
>>>
>>> We have only 7 kHz of spectrum and assuming "normal" sourrounding
>>> losses, you will not even need a variometer part. So it is just a coi=
l,
>>> some wire on a PVC tube and a ferrite transformer (or a tap or what y=
ou
>>> prefer), then cox to the shack.
>>>
>>> No problem! :-)
>>>
>>> 73, Stefan
>>>
>>>
>>> Am 30.10.2012 21:24, schrieb Graham:
>>>> Steiner
>>>>
>>>> That looks  a  little   1.6 MHz  ish   to  me  .coils  may  be  not
>>>> big enough  .   could  be  the  500  variometer  is missing  from th=
e
>>>> space  ?
>>>>
>>>> could make  a  auto  transformer  , next need a  series  coil of
>>>> sorts  , Ae  cap  will  do  the  rest
>>>>
>>>> G..
>>>>
>>>> --------------------------------------------------
>>>> From: "Steinar Aanesland" <saanes@broadpark.no>
>>>> Sent: Tuesday, October 30, 2012 2:09 PM
>>>> To: <rsgb_lf_group@blacksheep.org>
>>>> Subject: LF: Antenna tuner
>>>>
>>>>>
>>>>> Hi all,
>>>>> Is there anyone out there who is familiar with this antenna tuner?
>>>>>
>>>>> https://dl.dropbox.com/u/16381257/2012-10-29%2023.49.15.jpg
>>>>> https://dl.dropbox.com/u/16381257/2012-10-29%2023.49.36.jpg
>>>>> https://dl.dropbox.com/u/16381257/2012-10-29%2023.49.50.jpg
>>>>> https://dl.dropbox.com/u/16381257/2012-10-29%2023.50.00.jpg
>>>>>
>>>>> I got it from a HAM friend and will try to use it to tune my 600m
>>>>> antenna.  The trouble is that some parts are missing.
>>>>>
>>>>> --=20
>>>>> LA5VNA Steinar
>>>>> loc:JO59jq
>>>>> Mal and spam filtering: STRONG
>>>>> www.opera.no
>>>>>
>>>>>
>>>>>
>>>
>>>
>>>
>>
>>
>>