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

40-120 Antenna Loop
#4

Well I decided to pull the chassis out and trace out what was what with the mess of wiring around the loop frame. As far as I can tell, there were two thin wires that both terminated to a lug on the antenna terminal strip that ultimately connects to the chassis. I am assuming that each of these wires were wound around the antenna frame perpendicular to the antenna loop and basically were fastened at each end to a hole in the frame. Since this wire was cut in several places and some sections missing, that's what I can gather. Am I correct in this, and if so, is this some sort of 'ground plane' that is required for this antenna setup? When it comes time to work on this chassis I want to replace it - any help with the number of turns etc. would be helpful.

Another thing I discovered is that this unit has a mixture of cloth covered wire and the dreaded rubber insulated style. Some of the rubber pieces are deteriorating and I'll replace them. As far as the others, what is typical with the rest of you who work on these type chassis - do you typically replace all of the rubber wiring to be sure to nip future problems in the bud?

One last thing I noticed in looking at this one - the multi sectioned electrolytic was rated at 120v and the print shows a voltage measurement of 120V on one section. Nothing like working right at the rating of the unit - my cap looks like it has expanded out both ends of the cardboard tube.


Messages In This Thread
40-120 Antenna Loop - by TonyJSenior - 12-11-2007, 10:45 PM
[No subject] - by Jim Dutridge - 12-12-2007, 07:08 AM
[No subject] - by TonyJSenior - 12-12-2007, 08:15 AM
[No subject] - by TonyJSenior - 12-12-2007, 10:33 PM
[No subject] - by Jim Dutridge - 12-13-2007, 03:58 PM
[No subject] - by TonyJSenior - 12-13-2007, 08:47 PM
[No subject] - by TonyJSenior - 12-14-2007, 11:07 AM



Users browsing this thread:
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Hi OSanders, Look carefully at the band switch. Turn it slowly and "wiggle" it around the desired band. ...MrFixr55 — 12:33 AM
5U4 vs 5Z4 tubes
I think that RCA and GE introduced metal tubes in the USA in 1936.  I don't know if they were being made by RCA, GE or b...MrFixr55 — 11:20 PM
Philco 42-345 Restoration/Repair
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM
Philco 42-345 Restoration/Repair
Thanks Rod, "When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM

[-]
Who's Online
There are currently no members online.

>