Products > Test Equipment
Agilent E4406A Vector Signal Analyser
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davorin:
Nice :-) How did you set it up?

At least I could see now the spectrum of a demodulated FM broadcast Station with clear 19kHz pilote tone (o;

PA0PBZ:

--- Quote from: davorin on October 20, 2015, 04:08:15 pm ---It's a MRF89XA transceiver....but isn't FSK the same as frequency hopping?
 
--- End quote ---

No, frequency hopping means that the whole carrier jumps (semi) randomly to another channel, FSK stays on the same channel but shifts the carrier a bit around. So while FSK shifts the carrier a little bit around the zero position (a few KHz to 20-30 KHz up and down) when it does frequency hopping it can shift 100's of KHz and starts the FSK from that new position. Anyway, if you can see the carrier and it does not disappear there is no frequency hopping...
0xfede:
@davorin
The DUT is a commercial product I've designed several years ago. It uses a custom protocol (not developed by me) that has to be mantained for retrocompatibility.
I connected the DUT to the E4406A trough an HP 778D and a 20db PAD. The other port is connected to the Master transceiver (based on an hybrid module and it is not my design).
The 89600 software is quite complex to set up (but very powerful too) and I can't remember all the settings. If you need it I may send you the setup file.
For the differences between FHSS and FSK I'll make a measurement of another device (based on silabs SI103x). I hope I'll have time on Thursday to make some shots.

Best,
0xFEDE
harha:
Hello
My E4406A has a low frequency drop off at about 200Khz--some have wondered about if the front end  7dB attenuator also have a dc block inbuilt!
I have replaced this attenuator with a pecision narda--and the answer is simple-yes the original made by weinschel have a dc bloc,so now my E4406A goes down to a few Hz.Now using an external dc block when needed.
Hardy
TSL:
Santa brought an E4406A with the IQ option to my lab to day :)

I've been reading the docs and checking out its menu's, the only option missing is the IF out !

It needs a new CPU battery so I'll have to wait a few days or so for that to arrive before I take it apart :)

Haven't yet put a signal into it, just yet. Maybe in the next day or so once I've rebuilt the engineering PC.
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