[amsat-bb] Re: UHF Power divider/combiner (?) Identification help -Please.

i8cvs domenico.i8cvs at tin.it
Mon Dec 3 08:47:49 PST 2007

Hi Dave,

I know very well 132 blvd Dauphinot in Reims France and it is the
address of the plant of my friend Frank Tonna !

>From your description and since the full lenght is 19.5 mm it should
be the two port power divider model 29270 designed by Tonna for
435 MHz center frequency

Single input and both two outputs are designed for 50 ohm so that you
can connect two 70 cm 50 ohm antennas at the output ports and a 50 ohm
transmission line to the single input and then to your TX/RX

When two 50 ohm antennas are connected in parallel to the output ports
than the impedance at the output point becames 25 ohm but since the power
divider is 1/4 wavelenght long and its characteristic impedance is 36 ohm
it make the impedance transformation from 25 to 50 ohm for your coax

To test the power divider connect the input port to a 70 cm generator
through a VSWR meter and connect a 50 ohm dummy load to each
of the output ports.

The measured VSWR must be less than 1.15 at 435 MHz

Have fun.

73" de

i8CVS Domenico

----- Original Message -----
From: "Dave Aitch" <dave at g1ocn.com>
To: <amsat-bb at amsat.org>
Sent: Sunday, December 02, 2007 8:28 PM
Subject: [amsat-bb] UHF Power divider/combiner (?) Identification
help -Please.

> Single input, two outputs, all N type. 19.5 cms long.
> Looks like it is made from brass underneath the black paint
> The (silver foil ) description label is very worn.
> I see the following information on it.
> A small (male?) figure outlined, with a Yagi in it's right hand.
> The address:
> 132 Blvd Dauphine FRANCE
> Who was this made by please ?
> I need to gather the correct data before I put it on the market.
> Many thanks,
> Dave.
> AMSAT 5766
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