[AMRadio] need help


guyq guyq at comcast.net
Tue Oct 18 23:43:35 EDT 2005


How about dropping a swr meter between the rig and the amp. Terminate the
amp with a 50 ohm load.
Guy
----- Original Message -----
From: "Edward B Richards" <zuu6k at juno.com>
To: <amradio at mailman.qth.net>
Sent: Tuesday, October 18, 2005 11:26 PM
Subject: [AMRadio] need help


> Hi, you guys who are better educated than I. I want to drive a linear
> amplifier with a rice box that requires a 50 ohm load. The linear amp
> uses an input to a 170 ohm, 80 watt swamping resistor to ground, then
> through a .001 mfd capacitor, then through a VHF parasitic suppressor
> consisting of  4 turns of wire around a 47 ohm resistor, to the grids of
> a pair of parallel connected 4-400A tubes.
>
> What I need to know is the impedance of the input. Is it close to 50 ohms
> or do I need to use a matching network between the rice box and the
> linear amplifier. Thank you.
>
> Ed K6UUZ
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