Topband: CABLE MODEMS

[Tom Rauch]

> COMCAST here in MASS just changed to a different combo 
> cable
> and telephone modem....and I was knocking it right off 
> line
> with the first dit on 160 as well...

I had problems with a new ADSL installation and 160 meters. 
The problem is the ADSL system uses carriers up to 1 MHz or 
higher. So when you filter you can't hurt the level of those 
carriers or the speed will drop or sync become erratic.

The original modem was a little tiny cheap Netopia 2210-02. 
160 meters just killed it despite my having a very clean 
installation (all telco cables on my property are shielded, 
grounded, away from TX antennas, minimum length possible, 
and buried) and I constructed  some very good filtering.

I just plugged in a 2701HG-B Gateway ATT sent me as a 
replacement and there is absolutely no RFI at all even when 
I beam right at the modem.

The new modem was the result of reaching someone in tech 
support who understood RFI problems. He told me the Netopia 
2210-02 was not very good near transmitters and the 2701HG-B 
Gateway was far better. He was correct.

73 Tom