[ausmilsig] Fw: WSNo11 tx loading
- From: "pete williams" <jupete@xxxxxxxxxxxxxx>
- To: "ausmilsig" <ausmilsig@xxxxxxxxxxxxx>
- Date: Sat, 15 Apr 2006 17:30:10 +1000
Pete D . Williams
METUNG 3904
Australia
jupete@xxxxxxxxxxxxxx
----- Original Message -----
From: "pete williams" <jupete@xxxxxxxxxxxxxx>
To: <ausmilsig@xxxxxxxxxxxxxxx>
Sent: Friday, April 14, 2006 10:21 AM
Subject: Re: [Ausmilsig] WSNo11 tx loading
Pete D . Williams
METUNG 3904
Australia
jupete@xxxxxxxxxxxxxx
----- Original Message -----
From: "Ray Robinson" <robinson@xxxxxxxxxxxxxxx>
To: <ausmilsig@xxxxxxxxxxxxxxx>
Cc: <robinson@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, April 11, 2006 11:13 AM
Subject: [Ausmilsig] WSNo11 tx loading
DAVE
TEST # 2
THIS WAS THE FIRST MAIL TO RAY VIA "HOPELESS">>>>>>>>>>>>> MY LAST
TEST WITH FREELIST
REFLECTED OK.............. STILL NOTHING IN FROM THE "HOPELESS" INPUT
I MADE YESTERDAY ! !
73
Pete
RAY... if it's anything like HF and aircraft radio, the antenna
resistance is very low. For testing-----
From the antenna terminal, try 200 pf in series with a 10 ohm
noninductive and a 3 amp rf meter to chassis ground...... antenna
with a 52 ohm or higher impedance won't perform--- you need
characteristics of low impedance tuner to transfer power.
73
Pete
Hi gang,
I was trying to load my WSNo11(Aust) transmitter last night,
but cannot get the aerial currents the manual suggests.
It says LP about 200ma, HP about 500ma, (and WftW suggests about 5
watts).
I can only get about 50ma into a dummy load which means about 1 watt.
My dummy load can be switched between 10 to 400 ohms resistive,
and 500 to 100 pf to none for a series capacitance,
tried all those, but the watt meter barely moves above 1 watt.
So I tried a real aerial and it is the same.
So I tried a 12vdc light bulb, and managed to get near the suggested
values.
The manual suggests a dummy load of 16 ohms and 100pf,
but the light bulb is far lower than this.
Perhaps I have a fault.
I changed the 807, checked all the voltages, HP and LP,
checked the bypass capacitors, dipped the tank with a GDO,
looked at the output frequencies on a spectrum analyser,
drove the 807 grid with a signal generator.
I tweaked the tx alignment.
Nothing helped.
The receiver is working very well,
and the RF amp, mixer, BFO are used for the transmitter,
so any fault there would degrade the receiever.
What am I missing?
Regards
Ray
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