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Accurate field testing is a very
difficult task to achieve, I tried my best to capture as accurate data
as I could.
Anyone who has
done any
antenna comparisons can attest to the amount of signal variation that
can occur from day to day, hour to hour and even minute to minute.
How
I conducted
my tests
I tested each antenna several times over many
days
and each time the test antenna was compared to a base line antenna
and the data readjusted accordingly. Then I averaged the multiple tests
to come up with the results shown below. |
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The UHF
channels that were receivable on a daily basis at this site were
17,18,19,24,25,29,31,32,41,42,44,45,47,&49 They were coming from
different directions, see the TVFool plot for that location below for
more details.
The DTT900 DTV converter box was able to lock all the signals shown
here but the G-H and 4221 had frequent drop outs on CH's 31 & 49
and the DIY 4 bay had some drop outs on CH 31 but not as much as the
others. The monster vertical stacked 8 bay maintained a lock on all
channels and on good days would pull in even more. Readings were taken
with a B&K spectrum analyzer and the scale is in db's above the
analyzers noise floor. |
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The VHF-HI
channels
receivable at the field test location are 7,8,11 &13 CH's 11 and 13
are slightly over the hill from this location see TVFool plot below for
details. Only the 8 bay vertical stack and the CH11 Yagi could receive
CH11 and only the Yagi could receive CH13, the 8 bay could get an
occasional lock on 13. The 4 bay would show signal on the upper
channels but could never acheive a lock on the digital converter box..
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At the time of testing WIVT wasn't broadcasting on ch 34 |
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