Using the "138MHz-4.4GHz USB SMA Source/Signal Generator/Simple Spectrum Analyzer" for TV/CATV/SAT

frank-sinatra

frank-sinatra

Member
Messages
77
My Satellite Setup
Satellites/tv
My Location
Brazil
jeallen01

jeallen01

Specialist Contributor
Messages
3,787
My Satellite Setup
See Signature
My Location
Somewhere in England (possibly?)!
Este é o tipo de dc bloqueador?


Not those splitters!

VMA is referring to a DC blocker like this (I have one, and it works with SDRs when configured as he outlined) Axing SZU 14-00 DC blocker for Sat with F-connector: Amazon.co.uk: Electronics

PS: ignore the statement "This product cannot be configured to work in the UK. The Channel pre-selection and automatic channel programming features may not work." = totally irrelevant to use with a device like an SDR module.
 
Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Messages
27,838
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK South
I use a two way splitter with DC block on one side. Despite the change in balancing components, the actual signals on both ports are so close at all frequencies the difference is not worth calculating. I wouldn't want to look up a compensation chart each time for corrections on a standalone DC blocker (with unknown characteristics) plus two more inline - F connections.
 
vma

vma

Regular Member
Messages
278
Location
Portugal
My Satellite Setup
RX: 3 motorized DiSEqC-1.2 dishes (100cm, 110cm, 120cm) + 7 regular dishes.
Main receiver: Vu+ Duo + many others & IRD
TX: Modulators for DVB-S/C/T + Dektec Modulators
Field Meter: Emitor, KWS, Kathrein, Unaohm, Promax, Spaun, Rover Instruments, ...
My Location
Portugal
Just to let you guys know I have been working on my software and introduced error map compensation/calibration. This enhances the precision and measurement possibilities. Please look at the latest posts in VMA's Satellite Blog .

It requires a device with TWO synthesizers (ADF4350/ADF4351), so the cheaper SMA device cannot be used.

The cheap SMA device is nice as a spectrum analyzer attached at the LOOP THROUGH output of a satellite receiver (you MUST use a DC blocker!) and my software adds some interesting features like automatic transponder recognition & export, as well as, instant satellite recognition.

Regards,
Vitor
 
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