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Zenith 15U270
#17

So I put this radio back on the bench.  I played with the dial lamp - it was all the way in.  I found a different 47 lamp that was slightly longer and had the filament way out at the end.  It improved the dial lighting a bit.

I hooked the IF section up to the spectrum analyzer to see what I could do with the response curve.  Here are the results:


IF peaked per alignment instructions. At 6 db down the bandwidth is about +-3.5k.

   


I looked at doing this.  At 6db down, bandwidth would be about+- 7K but the sensitivity is down a lot.

   


I settled in on this. At 6db down, bandwidth is about +- 6k.

   


At the loss of quite a bit of sensitivity, I gained a fair amount of bandwidth.  Still not as good as the Philco 37-116. The radio does sound better with my HiFi transmitter, though.  That's the way I usually use my AM sets.  If I listen to real broadcasts, it's usually talk radio so the high frequencies are not needed.

Kind of fun to play with!


Messages In This Thread
Zenith 15U270 - by rfeenstra - 05-31-2020, 04:45 PM
RE: Zenith 15U270 - by rfeenstra - 05-31-2020, 04:54 PM
RE: Zenith 15U270 - by morzh - 05-31-2020, 06:10 PM
RE: Zenith 15U270 - by rfeenstra - 05-31-2020, 08:06 PM
RE: Zenith 15U270 - by morzh - 05-31-2020, 08:39 PM
RE: Zenith 15U270 - by Eliot Ness - 06-01-2020, 08:07 AM
RE: Zenith 15U270 - by rfeenstra - 06-04-2020, 08:12 PM
RE: Zenith 15U270 - by sdradioman - 06-05-2020, 07:06 AM
RE: Zenith 15U270 - by rfeenstra - 06-05-2020, 10:12 PM
RE: Zenith 15U270 - by morzh - 06-05-2020, 11:44 PM
RE: Zenith 15U270 - by Phlogiston - 06-06-2020, 10:46 AM
RE: Zenith 15U270 - by rfeenstra - 06-06-2020, 11:23 AM
RE: Zenith 15U270 - by rfeenstra - 06-06-2020, 06:23 PM
RE: Zenith 15U270 - by Phlogiston - 06-06-2020, 08:56 PM
RE: Zenith 15U270 - by rfeenstra - 06-06-2020, 09:47 PM
RE: Zenith 15U270 - by Phlogiston - 06-06-2020, 10:34 PM
RE: Zenith 15U270 - by rfeenstra - 06-09-2020, 09:14 PM
RE: Zenith 15U270 - by PhilcoJohn - 06-10-2020, 08:27 AM
RE: Zenith 15U270 - by Phlogiston - 06-11-2020, 11:32 AM
RE: Zenith 15U270 - by rfeenstra - 06-11-2020, 03:31 PM



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