Topband: Phasing lines

[clive at gm3poi.com]

Thanks Peter and Dave that's good to know. I'll be using a VNA anyway.  I am not surprised the VF does not vary that much because of the construction type.  73 Clive GM3POI

-----Original Message-----
From: David Olean <k1whs at metrocast.net> 
Sent: 03 March 2020 15:51
To: peter.voelpel at t-online.de; clive at gm3poi.com; topband at contesting.com
Subject: Re: Topband: Phasing lines

Hi Clive,

i have used chunks of LDF cable for phasing lines and my impression is that on VHF, you could trim them by the book and be well close enough. 
My impression is that they are very consistent from piece to piece. That being said, I always tested my lengths after cutting a bit long and then trimmed them to the actual phase length. (It is more fun to play with the test equipment!)

73

Dave K1WHS

On 3/3/2020 3:39 PM, dj7ww at t-online.de wrote:
> I have used LDF4-50 and LDF 4-75 by RFS for phasing lines on HF bands.
> They did as expected with 88%, however on VHF/UHF I would measure how 
> they behave.
>
> 73
> Peter
>
>
> -----Original Message-----
> From: Topband 
> [mailto:topband-bounces+dj7ww=t-online.de at contesting.com] On Behalf Of 
> clive at gm3poi.com
> Sent: Dienstag, 3. März 2020 16:30
> To: topband at contesting.com
> Subject: Topband: Phasing lines
>
> Hi all,
>
> I wonder whether anyone has used LDF4-50A for phasing lines and 
> verified the VF as being 88%. If not have you an idea of any spread on the VF.
>
> I want to use some where it could make the difference to cable length.
> However nothing will be assumed it will be measured. I note from the 
> spec that
>
> they give a tolerance of 5% but I doubt some how that the VF varies 
> that much.  73 Clive GM3POI
>
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