>the amplifiers will produce full power on
500 , but with the 50% efficiency , for single
carrier modes , >its not very cost effective !
On the other hand,if you would use one single
linear amp to TX two 15W carriers (tones in USB)
it would have to be capable of delivering
900W(!) PEP to stay linear.
73
Clemens
DL4RAJ
----- Original Message -----
Sent: Saturday, July 14, 2012 12:16
AM
Subject: Re: LF: Re: DUAL BEACON WSPR +
OPERA 500Khz
Well ,
I call it the E-Bay special , im not sure ,
which is more credible , building your own
equipment or keeping this old military
equipment running !
The 15 watts was set to give
signals just at the limit at G0KTN, who
has been decoding the 2 modes from the
start, down to about 5 watts now.
the amplifiers will produce full power on
500 , but with the 50% efficiency , for single
carrier modes , its not very cost effective !
If you can translate audio to RF
, the ROS MF-2 data mode will
operate down to -27 dB s/n , at 100 Hz
b/w . MF-7 is about -20 dB s/n 100 Hz
b/w
Good luck with the new station ,
73 - G ..
Sent: Friday, July 13, 2012 10:43 PM
Subject: Re: LF: Re: DUAL BEACON WSPR + OPERA
500Khz
Compliments on your impressive setup
operated
extremely conservatively for linearity reasons.
I hope to get on air this weekend with about 30mW
ERP in CW and WSPR.
Maybe I try later OPERA as well.
73
Clemens
DL4RAJ
----- Original Message -----
Sent: Friday, July 13, 2012 11:13
PM
Subject: Re: LF: Re: DUAL BEACON WSPR +
OPERA 500Khz
Yes Clemens
I am using m-delt4 sound card ,
with opera to one channel and wspr
to the other , the soundcard is mixing the two
data streams ...making a better job, than using
the same sound card ... Rf path is
the racal ma1723 exciter , direct on 500 KHz
, feeding , now , qty 2 skanti solid state
trp8500 250w pk o/p class ab2 linear
amps via a resistive splitter , the amps
are looking into a 5 port (1.5 kw)
combiner , audio drive is set to below agc action ,
or the modes change the pk power of the other
All this to make 15 watts
per carrier ! but the system is wide
band and will work up to 30 MHz , all I do
is change the ATU ...
73 -G.
Sent: Friday, July 13, 2012 9:54 PM
Subject: LF: Re: DUAL BEACON WSPR + OPERA
500Khz
It wouild appear that if one
is txing WSPR and
OPERA parallel on one
TX,the TX and (a possible) power
amp wouild have to be linear,
i.e. at least in class AB ?
73
Clemens
DL4RAJ
----- Original Message -----
Sent: Friday, July 13, 2012 8:06
PM
Subject: LF: DUAL BEACON WSPR + OPERA
500Khz
All,
DUAL BEACON WSPR + OPERA 500Khz
Running dual beacon , parallel Tx
times ......Tx 100% duty cycle
Dial set 500.000 Khz USB
73 - Graham
G0NBD
E-Mail ist virenfrei.
Von AVG
überprüft - www.avg.de
Version:
2012.0.2195 / Virendatenbank: 2437/5129 - Ausgabedatum: 13.07.2012
E-Mail ist virenfrei.
Von AVG
überprüft - www.avg.de
Version:
2012.0.2195 / Virendatenbank: 2437/5129 - Ausgabedatum: 13.07.2012
E-Mail ist virenfrei.
Von AVG
überprüft - www.avg.de
Version: 2012.0.2195
/ Virendatenbank: 2437/5129 - Ausgabedatum: 13.07.2012
