LF: Re: Re: NF MF

["mal hamilton" <g3kevmal@talktalk.net>]

Tracy

25 dB gain increase across spectrum 470 - 500 Khz.  Just checking antenna gain across band  of interest and not a scientific measurement. Signal over noise also looks good on beacon SA with 1 Khz selectivity, and can go down to 25 hertz if necessary.

Just looked at it again and it is the same except now geting hit by static crashes.

 

 

mal/g3kev

 

 

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

From: Tracey Gardner

To: rsgb_lf_group@blacksheep.org

Sent: Friday, June 22, 2012 1:24 PM

Subject: LF: Re: NF MF

Hello Mal

 

You don't quote the all important, the bandwidth that you were taking these measurements in.

 

I've just done a quick look on my receiver.

 

20kHz DDC bandwidth and 10Hz selectivity

 

Noise floor with no antenna < -150dBm

Noise floor with Beverage antenna connected < -140dBm 

 

73s Tracey

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

From: mal hamilton

To: rsgb

Cc: rsgb_lf_group@yahoogroups.co.uk

Sent: Friday, June 22, 2012 10:38 AM

Subject: LF: NF MF

MF

Experiment this morning on 475 Khz band.

 

Flex 3000 SDR rx on 475 Khz.

 

Noise floor - no antenna -----with 10dB attenuation inserted-------------120dB

 

Antenna 1/4 wave inv L connected  95dB therefore a gain of 25 dB

 

Time 0900 utc  ----daytime   Band quiet no static -- typical radio environment at this QTH

 

I must do this check after dark

 

g3kev