Having upgraded to an SDRplay RSPduo, here is a typical result from the overall M2 receiver system here at G8GKU, system details may be found below the image.
METEOR M N2
APRIL 13 2019
10:30 am.
ORBIT NUMBER 24700
North to South pass, over UK.
137.910 MHz +- Doppler
RECEIVING SYSTEM, from aerial inwards ….
AERIAL, crossed dipole 4 element turnstile, RHCP
PRE-AMPLIFIER, 24 dB gain ca 0.6 dB N.F.
SIGNAL FEED, 12 Meters coax, low loss double screen.
AMPLIFIER POWER, 9v @ 100 mA, bias T to coax
BAND PASS FILTER, 137.5 MHz, double tuned
RECEIVER, SDRplay RSPduo
SDR PLATFORM, SDRuno
POST PROCESSING, AUDACITY, re-sample to 192,000
SOFTWARE Rx, LrptRx
SOFTWARE DECODER, LRTPoffLineDecoder
All trademarks and software names gratefully acknowledged.
Thanks for the picture. You must have reduced the picture quality since the detail is lost…Good idea having a filter … I find I can increase the gain using a passive filter before the preamp. I must get back at it… too many projects!