Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 90 High Resistance Antenna Coil?
#1

Hello Ron

Continuing to try to analyze the low reception on some weaker stations, I measured the resistance of the antenna coil at the coil lugs themselves, which is about 10.7 ohms. The other side of the coil measured 6.8 ohms. Is this too high? Was under the impression that they should be about 3 ohms.

Reception improved almost 10 fold when I put the antenna lead on the grid of the RF, with no distortion throughout the dial, and with the volume control working perfectly. I'm not really comfortable removing the coil and was thinking of leaving the antenna lead hook up at the RF grid.

Any harm in doing this? The 90 has been playing set up with antenna to grid for 6 hours now with no ill effects, and the number of stations received like this is unbelievable!

Thanks for your thoughts or opinion on this. Joe


Messages In This Thread
Philco 90 High Resistance Antenna Coil? - by Joe - 02-04-2012, 02:39 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco model 60
>>and found that the field coil is bad. Should be 1140 ohms, tests at 1.1k ohms. You have one stringent crit...morzh — 02:07 PM
Philco model 60
Yes I was there. I got some real bargains there. Plus a Zenith 7G605 clipper that I have been trying to find for a fair ...Radios1340 — 01:46 PM
The speaker table error?
G  10-1/2"       65, 76, 87, 95 Push-Pull 45's 2766 0.7 550 3200 H   10-1/2"    77, 96 Push-Pull...morzh — 09:26 PM
A Marconi model 86
I have a Stromberg, one of the early ones, seems early 30s. This is what I call a back breaker. None of the early Philc...morzh — 08:28 PM
A Marconi model 86
A backbreaker.....PaulPaul Philco322 — 08:12 PM
A Marconi model 86
>>What a behemoth! A Juggernaut.morzh — 07:47 PM
Philco 70 antenna lead
I am not sure I understood about the coils and the mush. I looked an more than one coil in 20, 70, 90, 60, Zeniths and ...morzh — 07:46 PM
A Marconi model 86
:e_biggrin: What a behemoth!  I hope the final result is as much a quality sounding example!  Keep us posted on your pro...GarySP — 07:32 PM
A Marconi model 86
I should add that the double conversion may only be used on the shortwave bands, but I haven't looked at the schematic t...Arran — 07:27 PM
Philco 70 antenna lead
Yes, that wire will not pick up much interference as routed - the RF at that level won't be affected, and if you have st...radio1 — 07:26 PM

[-]
Who's Online
There are currently 7084 online users. [Complete List]
» 1 Member(s) | 7083 Guest(s)
Avatar

>