Hello Brad,
Yes, I understand your concern. There are many opinions of how the gear should be set up, and depending on what you have and what VERSION(s) you have, there may possibly be a specific way to inject the reverse.
Over the years, the GNA/TNA module went over various upgrades and versions, not to mention the little inventions and gadgets made along the way. Back in 1997 I was told there were some 30+ GNA types throughout the world. Some were manufactured with RESISTIVE testpoints, some with DIRECTIONAL COUPLED testpoints. Some had the ability to inject the reverse sweep on a testpoint, many not. The cover (if it still has the orginal cover) will be a good indicator. Many of the forward features and interstage components have been moved around the circuit board and the aluminum cover re-cut to accomidate new/upgraded features. Depending on what type plug-in devices you have, they possibly may not be compadiable with your unit if 750 or higher. Too many things to list here.
There is now a GNA module floating around (heard a large amount) now that came from New Zealand (or around that area) that once had a 65/85 split and re-furbed to a 42/54 sub-split for use back here in America. This re-furb WAS NOT done by Philips. I am not saying that they are bad units, but this is just another possible issue if not properly addressed.
As for the node transmitter setup, this will vary on what type of TX you have and the ingress/noise problems you may encounter. If your laser clips due to excessive inputs, this may need be adjusted at the lasers IP. Some lasers were referenced to 1 or 2 CW carriers.
Drop me a line or call and possibly I can be of assistance.
Greg Tobin
(-REDACTED-)
(314) 422-4423 cellular
Re: Magnavox GNA's and LE's...Different Versions
Member #: 7190
Registered: 1996-2001
Posted:
483
Name:
Greg Tobin
Name:
Greg Tobin
Company:
Interactive Broadband Technical Services
Occupation:
HFC Engineer/Consultant
Location:
www.interactive-broadband.com
Personal:
Experience:
~45 years
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