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Re: LF: Re: DUAL BEACON WSPR + OPERA 500Khz

To: <[email protected]>
Subject: Re: LF: Re: DUAL BEACON WSPR + OPERA 500Khz
From: "Clemens Paul" <[email protected]>
Date: Sat, 14 Jul 2012 11:21:16 +0200
References: <2EF69530CC694F89ADDC70851C979A5D@AGB> <015b01cd6139$b9f36a60$1502a8c0@Clemens04> <F99977F5765040E6B711308602D24A30@AGB> <005a01cd6140$928d7e00$1502a8c0@Clemens04> <8026234358FA4AF3B57CC6EB31339FC3@AGB>
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Graham,
 
>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 -----
From: Graham
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 -----
From: Graham
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 -----
From: Graham
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
 
 
 

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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

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