----- Original Message -----
Sent: Thursday, January 24, 2008 5:10
AM
Subject: Re: LF: Re. LF Receivers
Hi Laurence
Whilst I don't have experience the Perseus SDR RX, I do
with Softrock, same principle but simpler execution at radio
frequency (and much much cheaper).
You can at zero cost down load SDR software to play with. You
can also down load recorded examples of on air activity. This gives you the
ability to tune all over the band listen to various qso's in SSB or CW as if
you had the SDR RF section feeding your computer.
This technology is quite unique and very worth while the effort to try
out.
Alberto is quite right about the lack of a nice dial knob to turn but if
you are wedded to a nice big dial knob you can get a custom encoder that does
just that... at a cost though!!
One out of many advantages is you can see the signals as a panoramic
display or as a waterfall you vary the water fall speed and read the qrss CW
..... The Rocky software has built in PSK decoder and as I understand it other
decoder features are to follow.
So long as the SDR software you are using has an HP9TLK.DLL file attached
and similarly the decoder software then you have a Virtual Audio Cable
connectivity i.e. no need for external wire or additional sound cards.
The on board sound cards on most PCs are adequate if you are using a IQ
connection from your RF stage to the PC i.e. the mic input. It is worth
fitting a higher quality card see M0KGK's web site for an explanation.
One aspect of SDR is this the ability of recording the whole band
for later interrogation even if you had not tuned to that frequency during the
original recording.
The subject is too vast to detail it here but for a very small out
lay you can experience it first hand. Also the software is advancing
where all the signal prossing basically takes place so without change to the
RF section your radio can be up dated at no cost as this advance takes
place!
I hope this helps in your search for another RX ...... Alberto's
comments are very valid and the beauty is you can try it out at zero
cost.
I have no commercial interest in SDR I am just a poor retired HAM in
every sense of the word with a Bee in his bonnet ... hi.
73 petefmt
Well
I managed to fix my RA1792 receiver at last!
But all this investigation
has whetted my appetite for something better.
At the moment I am torn
between the AOR7030, conventional non DSP
a bit difficult to drive but
could be OK with computer display, spec. looks
good for LF. Or a take
drive in unknown country with the Perseus SDR.
I really am in the
dark here and would like to know wether is is neccessesary
to
re-digitise the audio output in order to get an ARGO FFT display or
does it
do this itself? and if so can I get 60/120 sec.dot
resolution?
Any help gratefully received.
73 Laurie
Sent from Yahoo!
- a smarter inbox.
