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In the Forum: Off Air Audio
In the Thread: Where the FM quality comes from?
Post Subject: The Boston FM classical outlook from my roof.Posted by Romy the Cat on: 7/23/2008

I have directional rotatable antenna the runs ~150 feet of coax cable; I think it is 6dB lost in cable. Then I have 4-way splitter that eats another 12db. I deal primary with 3 stations.

The WGBH is right next to me, one mile away and at the location what there are no other big stations. WGBH has 100kw transmitter and antenna 242 meters above sea level (I live at 50 meters above sea level). I receive them very well and their signal destroys the Sansui’s front end – the TU-X1 is faulty for overload by design). The signal maxes out the TU-X1’s signal meter. For the sake of do not let the TU-X1’s front end to drive itself in overload I attenuate signal for another 10dB, making it ~ 65% on TU-X1’s signal meter. There is practically no Multipath measuring with WGBH.

The WHRB is 2 miles away. It is a small station with 1.5kW small antenna right next to other big stations However; they are just across a river from me, so there is nothing between me and the station.  If I tune the antenna right to them then I get them very strong with TU-X1’s signal meter way out there. I attenuate signal for 18dB db for WHRB and uselessly make it ~ 85-90% on TU-X1’s signal meter. I have very little, if any Multipath with WHRB and the Multipath needle just slightly shakes around 0-5% with the strongest signals.

The WCRB is a different story. It is 25Miles away; it is 25kW transmitter and a lot of “mean” stations around. It has 238 meter antenna and located in kind of industrial town… I need to super tune antenna to WCRB, not in the station directly but in some strange offset to get it with less noise. I need to attenuate the WCRB for 22dB to kill the noise, making the signal at 50% on the TU-X1’s meter (yep, the manual attenuator is the TU-X1’s best friend). The Multipath meter in the best conditions hit 25% mark in the modulation picks, in bad FM weather even more…. I prefer to use the Rohde & Schwarz  for WCRB – no attenuation needed and no noise on reception when I get WCRB. With WHRB and WGBH the Schwarz and properly attenuated Sansui are comparable. With WCRB the Schwarz does better.

BTW, Clark the Miserable told me that there was a time when there were 8 classical stations in Boston…

The Cat

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