[MVMA] QRM to the MAX

[Moe]

I've cranked the transmit power of all MVMA nodes up to maximum to 
illustrate all the QRM caused by high-gain, high-altitude, zero 
down-tilt omnis. I'll leave it this way for a week or so to let you explore.

This is what our high-gain, high-altitude omnis are designed for--long 
distance.



20 dB S/N both ways... but a lot of QRM at DARA, as much as 10 dB above 
noise
and 10 dB below one of only four RF-connected network users in the Miami 
Valley.
There are two other MVMA sites close to DARA shut down because of their QRM.





This is the result... DARA "hears" AE8I at lower quality than AE8I hears 
DARA.
Part of that is due to having two users on DARA. *Omni receive link 
quality **
**goes down as users are added above one.*






Here's the RF at all the other Channel -2 omnis:


The *unused* W Xenia Omni QRMs the *unused* MVHS omni with 24 dB S/N
-- more than most *theoretical* *users* of the now *unused* MVHS will have.
-- because it isn't in the same SSID (to preserve LQ), the *unused* W 
Xenia Omni
    will transmit over *theoretical* *users* of MVHS Omni

The two user DARA Omni QRMs the *unused* MVHS with 10 dB S/N (as MVHS 
does DARA),
The *unused* WA8APB Omni QRMs the *unused* MVHS with 7 dB S/N and even
Wilimington does just above noise.





The *unused* WA8APB Omni QRMs the *unused* XWARN Omni with a whopping 24 
dB S/N
and because it's not in the same SSID (to make the NSM5s work), the 
*unused* WA8APB-Omni
can transmit over *theoretical**deployed stations* trying to use XWARN.





The *unused* WA8APB Omni QRMs the *unused* W Xenia Omni with a whopping 
26 dB S/N
and because it's not in the same SSID (to make the NSM5s work), the 
*unused* WA8APB-Omni
can transmit over***theoretical deployed stations* trying to use W Xenia.

The *unused* MVHS Omni QRMs the *unused* W Xenia Omni with 23 dB S/N and 
because it
isn't in the same SSID (to preserve LQ), it can transmit over 
*theoretical deployed stations*
trying to use W Xenia.

Even the two user DARA Omni at 13 miles distant QRMs the *unused* W 
Xenia Omni at
15 dB S/N.





Here's the result...  between *unused* omnis with 33 dB S/N, only 2.5 
miles apart, and 180'
and 95' high, the *unused* W Xenia omni "hears" the *unused* XWARN at 
lower quality.

This quality will decrease further as the number of*theoretical deployed 
stations* using
the now *unused* W Xenia Omni increase (and are interfered with by the *
unused WA8APB and MVHS omnis* in different SSIDs).




Did I mention that except at DARA, this is all academic?

-- 
Moe
73 de AB8XA

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