From: "Clemens Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <158269908ce.marcocadeddu@tin.it> <3AE1A816B0CB402AB1E75C3CEF20FC47@StevePC>
In-Reply-To: <3AE1A816B0CB402AB1E75C3CEF20FC47@StevePC>
Date: Wed, 2 Nov 2016 23:28:38 +0100
Message-ID: <B21C24E15F104B888F0D63EBA0CFC1AF@Clemens0811>
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Subject: RE: LF: Re: SWR Bridges
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Hi Steve,

if you prefer a reliable and accurate inline meter
there is a ready to use solution but you have to spend some money.
It's the digital vector wattmeter LP100A.
http://www.telepostinc.com/
You have to buy an extra coupler for LF/MW which covers 100kHz to 20MHz and is
capable to take up to 1kW continous power (conservatively rated) maximum.
(This may be even too low for some LW/MW operators...)
I'm using one myself and I'm very satisfied.
You can also use the directional coupler head alone as line sampler for use with e.g. a spectrum analyzer or scope.

73
Clemens
DL4RAJ 

>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org 
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Steve
>Sent: Wednesday, November 02, 2016 10:37 PM
>To: rsgb_lf_group@blacksheep.org
>Subject: Re: LF: Re: SWR Bridges
>
>Tnx Pete and Marco...yes, I agree that using an RF ammeter to 
>set impedance 
>match, once resonant, is a simple way for those that are without a 
>scopematch. For most LF/MFers however, it is only a matter of 
>time before 
>they construct the scopematch!
>
>Steve  73
>
>
>
>>
>> Hi Steve,
>>
>> wish to add just one comment sharing with you my experience.
>> For routine tests or measures on antennas since almost a dozen of
>> years use an home made VNA (I realized the N2PK VNA and still works
>> fine!) this make available visual and numerical datas which very
>> important to understand what I'm doing. As everybody, of 
>course, I like
>> to have an instrument in line while transmitting just to see is
>> everything is "normal" and under control. For this purpose I made a
>> small console which includes the low pass filter, an RF 
>ammeter and an
>> SWR bridge is very easy to design and make yourself such instrument I
>> made mine covering from 137kHz to 160m and I guess it is reliable at
>> least as all "in line" meters.
>>
>> 73 de Marco IK1HSS
>>
>>
>> ----Messaggio originale----
>> Da: VE7SL@shaw.ca
>> Data: 2-nov-2016 19.12
>> A: <rsgb_lf_group@blacksheep.org>
>> Ogg: LF: Re: SWR Bridges
>>
>> Many thanks to all of those taking the time to reply to my 
>inquiry. It
>> seems
>> that results vary depending upon what meter is being used 
>but it sounds
>> as
>> though only a few are having reliable / accurate results. I normally
>> use the
>> scope match and call it the 'most valuable piece of gear in my shack'
>> but
>> was curious about suggesting the use of an HF SWR bridge for 
>those that
>> do
>> not yet have such a thing, and if it would be a reliable method of
>> matching
>> an antenna. In some cases 'yes', but it seems, in most cases, may be
>> unreliable and only lead to confusion.
>>
>>
>> Steve  73
>>
>>
>>
>> WEB - "The VE7SL Radio Notebook":  http://members.shaw.ca/ve7sl
>> VE7SL BLOG - "Homebrewing and Operating Adventures From 2200m to
>> Nanowaves":
>> http://ve7sl.blogspot.ca/
>>
>>
>>
>>
>>
>>
>
>
>WEB - "The VE7SL Radio Notebook":  http://members.shaw.ca/ve7sl
>
>VE7SL BLOG - "Homebrewing and Operating Adventures From 2200m 
>to Nanowaves": 
>http://ve7sl.blogspot.ca/ 
>
>