Philco 52-541 Loop Antenna Help - Printable Version
+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: Philco 52-541 Loop Antenna Help (/showthread.php?tid=17562)
+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: Philco 52-541 Loop Antenna Help (/showthread.php?tid=17562)
Philco 52-541 Loop Antenna Help - christge9 - 11-24-2017
Philco 52-541 - Was wondering if someone could tell me how many turns the loop antenna has? Mine is missing.
RE: Philco 52-541 Loop Antenna Help - David - 11-24-2017
Looking at the sch you could use a ext ant, sorry unable to answer your question.
RE: Philco 52-541 Loop Antenna Help - Radioroslyn - 11-24-2017
>Looking at the sch you could use a ext ant
Not so much. The circuit needs to have the loop in circuit to form the tuned circuit connected to the input of the mixer. I don't think there is anything particularly special about the loop except the size and the inductance. If you happen to have a spare loop from another set that fits give it a go. If your spare was use with 365 pf tuning cap then it should fine as is. You can check it's resonant's by how well it receives at the high end. If the ant trimmer doesn't have a peak remove a turn from from the loop.
Or
http://www.sparkbench.com/loopante2.html
GL
Terry
RE: Philco 52-541 Loop Antenna Help - w4rtc - 11-25-2017
Mine has 16 turns of about # 26 gauge enamel wire. It is wound flat, like ribbon cable, wound to fit the  inside of. The cabinet
Joe
RE: Philco 52-541 Loop Antenna Help - christge9 - 11-25-2017
Thanks Terry, I tried a generic loop (from tubes and more) with poor results, and one from a GE J64 which was better, but I think not right.
Thanks Joe, I'll give that a try. SAMS diagram quoted a value of 3.1 ohms.
RE: Philco 52-541 Loop Antenna Help - christge9 - 04-14-2019
For anyone interested, this was resolved using 16T of #29 wound around a cardboard form (shaped to the cabinet opening). I secured the windings with varnish to brown packing paper, which looked authentic.
Measured 3.1ohms, 0.227mH; which was right in the middle of what the resonance calculator determined (using ends of tuning cap range).
Performance was great, and even worked well without an external antenna.