Re: [Discuss-gnuradio] RFX400 Antenna Connection

[Jeremy Chew]

Thanks. Here is an update...

So far I have tried all the following together: 
- Increasing the cable attenuation value to 50dB 
- Cutting the receive gain setting to 0
- Using high-frequency cables

There is no apparent change, so I may have to cut the transmit power.

Jeremy 

----- Original Message ----- 
From: "Matt Ettus" <address@hidden>
To: "Jeremy Chew" <address@hidden>
Cc: <address@hidden>
Sent: Tuesday, March 06, 2007 1:40 AM
Subject: Re: [Discuss-gnuradio] RFX400 Antenna Connection


> Jeremy Chew wrote:
> > Hi,
> >
> > I am trying to eliminate channel error by using a cable to connect two 
> > RFX400s together. The strange thing is that nothing useful seems to 
> > get through when the radios are connected by cable. I have tried 
> > attenuation in the range from 0 to 40dB and with several cables to no 
> > avail. Using antennas works much better.
> >
> > Do you know what is wrong? And what should the cable attenuation be?
>
> The cable attenuation needs to be at least 40 dB for safety.  It 
> probably needs to be more for signal integrity.  Have you adjusted the 
> receive gain downwards to compensate for the high signal levels?
>
> Matt