Re: tuner loss

---------

From: marion@montana.com
Date: Sun Aug 16 1998 - 11:34:11 EDT


At 10:52 AM 8/16/98 +0200, you wrote:
>> I'm not sure I understand a 25% loss either. Just tuned my Sierra
>> with the ZM-2. Four watts out of the radio, 3.75 watts after the tuner. ??
>> Roy AB7CE
>
>Roy,
>
>I don't want to deny your results, after all losses vary according to
>the load matched, but how do you measure power? I use different
>methods and usually they all give different results. The exact amount
>of loss being the difference of two power levels it will be much more
>uncertain than the already uncertain power levels.
>
>In particular, I'm interested to know how you measured the power after
>the tuner. I wouldn't know how to do myself this unless the load is 50
>Ohm resistive.
>
>cul,
>Arjen Raateland
>oh2zaz
>
>--... ...-- -.. . --- .... ..--- --.. .- --..
>Finnish Environment Institute, Helsinki, Finland
>SAS Support
>EMAIL: Arjen.Raateland@vyh.fi
>tel. +358 9 4030 0457
>fax +358 9 4030 0490
>.-.-. -.-
>
> Just have a power meter before and after the tuner. If I tune to a 50ohm
load, there is no decernable loss, using two OHR WM-2s. Which is what I
would expect. If I tune the dipole cut for 40, to something odd as 17mtrs,
then I measure out 4watts, after the tuner 3.5 watts. which is also about
what I would expect. But then I'm not an engineer. Some times that helps,
some times its a hindrance. ;^) 73 Roy AB7CE


Search QRP-L Archives

[ QRP-L Archive | ]
[ 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 ]

---------

This archive was generated by hypermail 2b29 on Fri Jun 02 2000 - 11:37:57 EDT

kd4ab@kd4ab.org