www.timesmicrowave.com
Go to the online calculator and figure up the losses on your cable. Be sure
to set the freq at 5800 mhz.
I'd not even count the connectors as loss, they are usually in the .1 to .5
range. But for a survey adding 1dB of loss per connector is safe.
As I read this they had a total of 250ish feet of coax? Certainly there's
gonna be basically no signal on the ground.
Here's what I'd do....
Go up there with your tools and take pics of what you see. Tell them that
something just didn't feel right about the methodology employed and you
wanted to check your methods against theirs. Then show them what you found.
This way it's non offensive to anyone and you should gain a customer for all
future work.
Good luck,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message -----
From: "Cliff Leboeuf" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Thursday, February 09, 2006 8:07 AM
Subject: [WISPA] Flawed Spectrum Analysis (I think!)
We proposed a spectrum analysis for a client. This analysis was to be
performed with a hand-held spectrum analyzer at the height that the
equipment was to be mounted. Our offer was rejected.
However, we were asked to provide the climber for the other party's
analysis.
Their analysis was performed as follows:
1. Using a 'nice' spectrum analyzer
a. the analyzer remained in their truck
b. the antenna from a 5.8Ghz Redline system was hauled about
140'
c. the original RF cable used was RG6 for 140'(duh?)
d. the next 140' of RF cable used was LMR400
e. we know that we shoot directly through one of the sites
surveyed with 5.8Ghz P2P link, and have 5.8 P2Mp links at two other
locations surveyed
f. all analysis showed no RF interference (go figure!)
I'm not an RF engineer, so would someone help me to explain why there
was no 5.8Ghz interference shown at these locations even though I know
there to be other 5.8Ghz equipment hitting the towers tested.
What is the RF cable loss at 140' of using LMR400 as described above?
Also factor in about 4 connectors to adapt the RF cable from the
analyzer to the antenna.
Is this a valid analysis, or am I wrong to comment to this customer that
I feel this analysis if flawed?
"Ammunition" that anyone is willing to supply would be appreciated as
well as advice for me to keep my mouth shut. :)
- Cliff
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