----- Original Message -----

From: Peter March

To: [email protected]

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!

 

Follow the Softrock-40 Interest Group for up to date information.

 

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.

 

Try http://www.flex-radio.com/ but ignore all the expensive toys, just the free software.

 

73 petefmt 

 

 

lawrence mayhead <[email protected]> wrote:

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

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