I have performed some detailed signal-strength measurements with this 150PVR box and some inline attenuators. Here are my results:
The above columns are as follows:
A) Displayed Virtual Channel
B) Frequency (as displayed by 150-PVR) in Mhz
C) Transmit Power (kw)
D) Direct Antenna Connection
E) Using 3 db attenuator
F) Using 6 db attenuator
G) Using 10 db attenuator
H) Using 16 db attenuator (10 + 6 in series)
I) Direct Antenna connection, using only center conductor
J) Signal Power (dBm) from TV Fool report
K) Distance to transmit tower (miles)
Columns D through I are the average "quality" value displayed by 150PVR unit under various situations for 5 different ATSC broadcast channels. Each number is the average of 2 readings (a high and low) noticed during about 20 to 30 seconds of viewing. The difference between these high and low values ranged from 2 to 9, and was highest for column I (6) and lowest for column F (3). In all cases, the signal strength changed rapidly from one value to another from second to second.
Attenuators were in-line type, exactly like this:
Column (I) had antenna cable F connector inserted into 150PVR just enough for center conductor to make contact, but external shield nut was not in contact.
150PVR unit will NOT show any signal strength below numerical value 38. Video picture will pixilate at 39 or 40 and at 38 will disappear completely. No signal strength value less than 38 has ever been displayed (anything under 39 or 38 will result in no picture and hence no information is displayed).
Antenna: Digiwave 2190
I have a 5 mm mesh mounted to the reflector to increase forward gain. This presumably makes the antenna more directional.
Channel 10.1 broadcasts from its own tower about 1 mile from my antenna. The other 4 channels are on the same tower (about 4 miles away) and my antenna is pointed directly at that tower. So my antenna is pointed about 160 degrees away from the closer channel-10 tower.
General observation is that signal strength improves as attenuation is increased, even when up to 16 db of attenuation is used.
Now I'd like anyone to comment on these signal strengths, given the relatively weak transmission power of the towers in question, and the use of some very strong attenuation.