Re: Re[2]: LF: IDC-136-BLT 136kHz receivers

["Graham" <g8fzk@g8fzk.fsnet.co.uk>]

Amplified   pre  selector  and  one of the  £5  usb  stick's  in direct sample ,  ala   0.001 uF  to  the  A/D ..Can pay £$£ more ,  but  these  take a  lot  of  beating ..

 

Amp  gain , say   10 dB  , output   Z  round  200  ohms 

 

sdr-sharp  gives  full  access  to the  dongle   manual  gain and   agc  etc

 

Even  no  pre-amp  , looking  at the   Tx tuner ,  puts  up a good  job

 

Simons  multi  session  sdr-console ,   gives   true multi  mode  , multi  qrg  monitoring , but may need  a  convertor

 

Put any  cash out lay  into  the   pre selector  and  pre-amp  ..

 

73-G,

 

From: Andy Talbot

Sent: Thursday, June 04, 2015 2:30 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: Re[2]: LF: IDC-136-BLT 136kHz receivers

No, a completely different approach.  For one thing teh LO has to be supplied at 4*

Someone must do an LF version of the Softrock - surely

Andy

On 4 June 2015 at 14:25, Chris Wilson <chris@chriswilson.tv> wrote:

Hello Andy,

Thursday, June 4, 2015


> AH, thanks for finding that - must have missed it on first looking.
> Yes I agree, the NE612 is a poor mixer to use for those purposes.  
> A diode ring, or bus switch would do a muxch better job


> But why not an I/Q conversion and make use of all the decent SDR software out there?   


> Andy  G4JNT


I  think  they  also  do  an  IQ  version, not sure if it's currently
available.  I  don't  suppose  the  other  IC  is a direct swap is it?
Thanks.






--
Best regards,
 Chris                            mailto:chris@chriswilson.tv