:Greetings, I have a Radiola 526 (AM and SW), I just finished re-capping it and it plays well on AM. There is a un-canned device on the chassis marked on the schematic as Ant. Coil. Is this for the short wave part of the radio? or for the external antenna terminal? or both? Should this device be canned? The screw on top of the coil is turned all the way in one direction.. When I turn it the opposite way nothing happens to AM reception. I believe this radio was serviced many years ago as I have found the electrolytics inside the radio as incorrect vs the schematic. I do not have a long wire to test the SW as of yet? How should I approach the testing of this device? As you know from my previous postings, I am a beginner and do not have any alignment tools. The other transformers I would not touch as the radio play nicely on AM.
:Thank you,
:Vinny
:Greetings, I have a Radiola 526 (AM and SW), I just finished re-capping it and it plays well on AM. There is a un-canned device on the chassis marked on the schematic as Ant. Coil. Is this for the short wave part of the radio? or for the external antenna terminal? or both? Should this device be canned? The screw on top of the coil is turned all the way in one direction.. When I turn it the opposite way nothing happens to AM reception. I believe this radio was serviced many years ago as I have found the electrolytics inside the radio as incorrect vs the schematic. I do not have a long wire to test the SW as of yet? How should I approach the testing of this device? As you know from my previous postings, I am a beginner and do not have any alignment tools. The other transformers I would not touch as the radio play nicely on AM.
:Thank you,
:Vinny
ASPECT 1:
Looking at that schema we see that the BC-SW on the rear is shunt switching the BCB and SW osc and ANT coils in order to
convert between the two bands. Concentrate on a vewy close examination of that switches contacts and see if there is a possibility
that with the unit being left in the BCB position for the last “ one hunna lebenteen years”, it has not left its SW contacts so badly oxidized that one set is not actually switching to make good contact.(Ohm it out for confirmation).
73's de Edd
marv
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:ASPECT 1:
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:Looking at that schema we see that the BC-SW on the rear is shunt switching the BCB and SW osc and ANT coils in order to
:convert between the two bands. Concentrate on a vewy close examination of that switches contacts and see if there is a possibility
:that with the unit being left in the BCB position for the last “ one hunna lebenteen years”, it has not left its SW contacts so badly oxidized that one set is not actually switching to make good contact.(Ohm it out for confirmation).
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:ASPECT 1:
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:Looking at that schema we see that the BC-SW on the rear is shunt switching the BCB and SW osc and ANT coils in order to
:convert between the two bands. Concentrate on a vewy close examination of that switches contacts and see if there is a possibility
:that with the unit being left in the BCB position for the last “ one hunna lebenteen years”, it has not left its SW contacts so badly oxidized that one set is not actually switching to make good contact.(Ohm it out for confirmation).
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:ASPECT 1:
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:Looking at that schema we see that the BC-SW on the rear is shunt switching the BCB and SW osc and ANT coils in order to
:convert between the two bands. Concentrate on a vewy close examination of that switches contacts and see if there is a possibility
:that with the unit being left in the BCB position for the last “ one hunna lebenteen years”, it has not left its SW contacts so badly oxidized that one set is not actually switching to make good contact.(Ohm it out for confirmation).
:Edd, should I at least get loud static or any loud noise when the volume is turned all the way up? It is just very very faint.
:Vinny
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::ASPECT 1:
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::Looking at that schema we see that the BC-SW on the rear is shunt switching the BCB and SW osc and ANT coils in order to
::convert between the two bands. Concentrate on a vewy close examination of that switches contacts and see if there is a possibility
::that with the unit being left in the BCB position for the last “ one hunna lebenteen years”, it has not left its SW contacts so badly oxidized that one set is not actually switching to make good contact.(Ohm it out for confirmation).
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:ASPECT 1:
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:Looking at that schema we see that the BC-SW on the rear is shunt switching the BCB and SW osc and ANT coils in order to
:convert between the two bands. Concentrate on a vewy close examination of that switches contacts and see if there is a possibility
:that with the unit being left in the BCB position for the last “ one hunna lebenteen years”, it has not left its SW contacts so badly oxidized that one set is not actually switching to make good contact.(Ohm it out for confirmation).
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:ASPECT 1:
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:Looking at that schema we see that the BC-SW on the rear is shunt switching the BCB and SW osc and ANT coils in order to
:convert between the two bands. Concentrate on a vewy close examination of that switches contacts and see if there is a possibility
:that with the unit being left in the BCB position for the last “ one hunna lebenteen years”, it has not left its SW contacts so badly oxidized that one set is not actually switching to make good contact.(Ohm it out for confirmation).
Edd, sorry to be a nuge, should the Ant. coil have some kind of can or protective device over it? NO problem with the set design not having a cover / shielding over it, as this is a set without a extra RF ampstage in the front end design, Does not having one minimize reception for the SW and create any distortion or abnormalities to the receptive quality? Nope, might even enhance reception on stronger ones that could be picked up via the coil proper, whereas if it was shielded, [I have since followed your advice and received some results, even stayed up overnight to try and tune in stations] That last portion, with some of its words, keyed in a couple of truisms: 8 feet My first SWL antenna, as a pre teenager, was the fine wire unrolled from an old dynamic speakers field coil , using about apartment. . . .(or houses) Try a decent length of outside antenna , put up temporary, for its typical use in the eve or wee hours THEN, according to results,
where that just might present a feed back problem in that situation.
it would be dependent upon piped in RF thru the ext antenna connection.
using a short 8'
wire by the windows.
I have received some stations in different parts of the apartment, but nothing clear sounding.
is a veeeeery short "aerial" wire length.
50 ft of it. I was using glass insulators on the ends made by taking two coke bottles and circling their open ends around
themselves and then rapidly pulling the bottles apart, such that one of the lip ends would fracture off the outer portion
and leave you with a glass ring, you could either wear it on your finger or use it as an antenna insulator. . . . as I did.
A spark plug with its side connector tapped ever closer into the center electrode, with a sheet of paper acting as a spacer,
then being pulled out,
let me fabricate a lightning arrestor.
That was then connected to a close good earth ground. When normally not in use, a knife switch inline after the arrestor
opened the aerial circuit completely for furthering protection and isolation.
There was a certain transitional point where there was phased in use of alumi-ninni-yum- yum faced insulation both inside on fiberglass batting and also on the outside of residences, where one had a quite dead RF reception inside those domiciles.
As for the window screens there was still the attenuaton from metal grid wire mesh, unless it was fabric instead. Additionally there also might be the use of E-efficient glass where there are microns thicknesses of metal placed on via electrostatic vacuum deposition, where that also would be a source of RF shielding.
you can see how much of a scaling back is then permissible.
73's de Edd
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:Edd, sorry to be a nuge, should the Ant. coil have some kind of can or protective device over it?
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:NO problem with the set design not having a cover / shielding over it, as this is a set without a extra RF ampstage in the front end design,
:where that just might present a feed back problem in that situation.
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:Does not having one minimize reception for the SW and create any distortion or abnormalities to the receptive quality?
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:Nope, might even enhance reception on stronger ones that could be picked up via the coil proper, whereas if it was shielded,
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:it would be dependent upon piped in RF thru the ext antenna connection.
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:[I have since followed your advice and received some results, even stayed up overnight to try and tune in stations]
:using a short 8'
:wire by the windows.
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:I have received some stations in different parts of the apartment, but nothing clear sounding.
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:That last portion, with some of its words, keyed in a couple of truisms:
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:8 feet
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: is a veeeeery short "aerial" wire length.
:
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:My first SWL antenna, as a pre teenager, was the fine wire unrolled from an old dynamic speakers field coil , using about
: 50 ft of it. I was using glass insulators on the ends made by taking two coke bottles and circling their open ends around
: themselves and then rapidly pulling the bottles apart, such that one of the lip ends would fracture off the outer portion
: and leave you with a glass ring, you could either wear it on your finger or use it as an antenna insulator. . . . as I did.
:
:A spark plug with its side connector tapped ever closer into the center electrode, with a sheet of paper acting as a spacer,
: then being pulled out,
: let me fabricate a lightning arrestor.
:
:That was then connected to a close good earth ground. When normally not in use, a knife switch inline after the arrestor
: opened the aerial circuit completely for furthering protection and isolation.
:
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:apartment. . . .(or houses)
:
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:There was a certain transitional point where there was phased in use of alumi-ninni-yum- yum faced insulation both inside on fiberglass batting and also on the outside of residences, where one had a quite dead RF reception inside those domiciles.
:
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:As for the window screens there was still the attenuaton from metal grid wire mesh, unless it was fabric instead. Additionally there also might be the use of E-efficient glass where there are microns thicknesses of metal placed on via electrostatic vacuum deposition, where that also would be a source of RF shielding.
:
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:Try a decent length of outside antenna , put up temporary, for its typical use in the eve or wee hours THEN, according to results,
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:you can see how much of a scaling back is then permissible.
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:73's de Edd
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