CM4228 and CM7777
- A while back, I got a Channelmaster 4228 (8 bowtie) and 7777 pre-amp
and promised the list an update when I installed them. I installed
them this weekend, so here goes.
This setup replaced an old VHF/UHF antenna. I don't know the model
number, but it was about 8 or 9 feet long and looked like a pretty
standard configuration, mounted 20-25' from the peak of the roof.
I mounted the 4228 on a 15' pole from the chmney, so it ends up maybe
5-10' from the roof peak. Without the pre-amp, it perfomrs atleast
well as the old antenna, maybe slightly better on the 2 stations that
I had the weakest signal on. With the pre-amp, it is noticably
on those channels. Measured on a DTC-100, the pre-amp seems to add
2-4 points to the signal strength on the weaker channels.
The thing that surprised me the most is that I found a single
that seems to give good results for all channels. I had anticipated
that I would need to use the rotor to tune in channel 36 (digital
since it is not located on Sutro; in my initial tests, I also saw
some of the stations on Sutro seemed to get picked up better from
different headings (I'm in a hilly area, w/o a direct line of sight).
But I'm able to get all of the Sutro channels and a strong signal on
36 with the antenna in a single position. With the old antenna, I
could not get a reliable lock on 36 and it was not watchable. I also
get a better signal from 44/45; although I could get that most of the
time with the old antenna, it sometimes would not lock and generally
had a signal in the 40s. Last night, I had solid lock and the signal
was in the mid 70s.