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Old 25-Dec-2020, 2:39 AM   #1
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,677
CM-3201 LTE Filter (New) Attenuation

Code:
Attenuation of Channel Master NEW CM-3201 
LTE Filter for the 14-36 UHF TV Band

Channel  Input   Output  Attenuation
  RF*     dBmV    dBmV      dB

   14     12.1    11.5      0.6
   25     10.5    10.3      0.2
   34     10.3     8.2      2.1
   35     10.1     8.0      2.1
   36     10.2     6.9      3.3   
   37     10.2     3.5      6.7
   38      9.8    -6.0     15.8
   39      9.2   -18.3     27.5
   40      8.5   -31.5     40.0
Input level to filter increased 20 dB
because of increased filter attenuation
   50     29.3   -42.3     71.6
   55     27.1   -46.0     73.1  
* Frequency of measurement for each channel 
was video frequency if it had been an NTSC 
channel; i.e. 1.25 MHz above low end of channel

Equipment used:
CM-3201 LTE Filter
F-81 Adapter
Blonder Tongue HAVM UHF NTSC Agile Modulator
Sadelco DisplayMax 800 Signal Level Meter
For comparison, a measurement of the filter by videobruce:

Attached Images
File Type: jpg CM-3201 by videobruce3.jpg (110.6 KB, 69 views)
File Type: jpg CM-3201-NEW Attenuation2.jpg (154.1 KB, 43 views)
__________________
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
http://www.megalithia.com/elect/aeri...ttpoorman.html

Last edited by rabbit73; 25-Dec-2020 at 11:44 AM.
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