100W.S. mode switch

[trfh]

Folks,

I have a 100W.S. transmitter which I am just starting to look at. One odd thing I have spotted: the mode switch has four positions marked on the front panel:

• Empfang
• Aus
• Telegrafie
• Telefonie

However the switch will only go to the last three positions - "Empfang" is not accessible. There is nothing obviously wrong with the quite complicated double switch, but I haven't taken it apart as yet.

Is this normal? Has the transmitter been modified to remove the "receive" mode? Or do I have a fault here?

Richard

[rv12p2000]

hello

[rv12p2000]

hello
you have some explanations in German Tm about this transmitter see:

http://www.cdvandt.org/L-Dv-702-1-Heft-152-100WS.pdf

you have the schematic diagram and training document

regards rv12p2000

[Funksammler]

I suspect the switch needs some attention, it would not be a modifcation to block the Empfang position. The Emfang position switches the antenna to the receiver; in the Aus position the receiver antenna is disconnected.

regards,

Funksammler

Folks,

I have a 100W.S. transmitter which I am just starting to look at. One odd thing I have spotted: the mode switch has four positions marked on the front panel:

• Empfang
• Aus
• Telegrafie
• Telefonie

However the switch will only go to the last three positions - "Empfang" is not accessible. There is nothing obviously wrong with the quite complicated double switch, but I haven't taken it apart as yet.

Is this normal? Has the transmitter been modified to remove the "receive" mode? Or do I have a fault here?

Richard

[Yuri D.]

Based on studying the schematic, the 100W.S. Empfang setting does not heat the tubes. In other transceivers (10W.S.c), the Empfang setting heats the tubes to keep the transmitter ready for operation. So when you switch to Tg or Tn, the Umformer starts spinning to provide the anode voltage. All the "Empfang" setting does is give access for the receiver to the 100W.S. antenna connector.

Can someone please confirm this.

[trfh]

Thanks for replies on 100W.S.

Folks,

thank you for all the comments made so far. I understand what the "empfang" (receive) position is for, however I am hoping someone has detailed knowledge of the history of these transmitters and could say whether a modification was introduced (officially) to stop the switch moving to the "empfang" position.

Thanks for the link to the manual. My German is not good, so it would take me a while to work through all the text just to see if there is something special about this switch mentioned in there.

If no-one is sure what is going on here, I will have to strip the switch out and see if a "spanner" has fallen in the works somewhere!


Richard

[trfh]

Another fault on the 100W.S.

It might be worth mentioning that I also found the heater (Heizung) rheostat was completely seized. It had to be removed from the set, the bearing soaked in oil, and gradually eased with a large pair of pliers before it would start moving again. Its now working smoothly.

That suggests to me that this transmitter has sat somewhere - possibly damp - for a very long period, without any use. I am not sure how that could affect the mode switch, which moves easily into 3 positions (Aus, Telegrafie and Telefonie), but totally jams when I try and move it to "empfang".

Richard

[Yuri D.]

Please post photos

[trfh]

100W.S. - photos

Please post photos

Yuri,

yes, here is a selection of photos of the relevant area of the transmitter. The first one is a general view of the underside, with the switch in question outlined in white.



The next one is the front panel side of things. The mode switch is right under the serial number plate. Left of that is the Heizung rheostat which I unseized.



The mode switch itself is in two sections coupled together by large (paxolin?) geerwheels. This next photo shows the lower of these two switches, which is part number 3a (painted on in red):



That lower switch is itself in two halves, with the left hand half handling high voltage/power signals (that's the big clunky contacts), and the right hand half handling lower power switching (small contacts).

Then above that is the upper parts of the switch, part number 3b (also painted on in red). This half handles antenna switching:




Unfortunately, I can't show you whatever might be blocking the switch going to the "empfang" position - because I can't see anything there myself. It all looks in excellent order!


Richard





Richard

[trfh]

Wot - no photos?

Yuri,

just looked at my reply to you - can't see any photos there. The photos are in my Dropbox folder, and I just posted the links to them using the "IMG" tags as normal. Is there some problem with Dropbox on this forum?

Any other way of posting photos?


Richard

[rv12p2000]

hello
do not forget that the grease or oil after a certain time blocks axes
especially the grease that is becoming as stone

regards rv12p2000

[trfh]

Grease like stone?

hello
do not forget that the grease or oil after a certain time blocks axes
especially the grease that is becoming as stone

regards rv12p2000

Well, clearly the grease has not gone hard in the switch bearings because it is turning quite freely. Except into the Empfang position.

I suppose a lump of grease "like stone" could have fallen into the switch somewhere - but I can't see anything of that kind.

All I wanted to know was whether other owners of the 100W.S. have seen this problem or not. It would appear from the answers received, that no-one has seen this before.


Richard

[trfh]

Another go with the photos of the 100W.S.

Folks,

here is another go at posting my previous reply to Yuri with the photos this time. (I've resorted to photobucket this time).

I'm not sure how the photos help - however maybe it will jog someone to share any relevant experience of this transmitter.

I'm going to have a go at stripping out the switch tomorrow - provided its not absurdly difficult (which is a problem I encounter rather too often with German equipment).

Richard

Quote:
<table width="100%" border="0" cellpadding="6" cellspacing="0"><tbody><tr><td class="alt2" style="border:1px inset"> Originally Posted by Yuri D.
Please post photos
</td></tr></tbody></table>
Yuri,

yes, here is a selection of photos of the relevant area of the transmitter. The first one is a general view of the underside, with the switch in question outlined in white.



The next one is the front panel side of things. The mode switch is right under the serial number plate. Left of that is the Heizung rheostat which I unseized.



The mode switch itself is in two sections coupled together by large (paxolin?) geerwheels. This next photo shows the lower of these two switches, which is part number 3a (painted on in red):



That lower switch is itself in two halves, with the left hand half handling high voltage/power signals (that's the big clunky contacts), and the right hand half handling lower power switching (small contacts).

Then above that is the upper parts of the switch, part number 3b (also painted on in red). This half handles antenna switching:




Unfortunately, I can't show you whatever might be blocking the switch going to the "empfang" position - because I can't see anything there myself. It all looks in excellent order!


Richard

[Yuri D.]

Beautiful transmitter. All I have to say here is that even though the switch looks immaculate, things shift over the many years after 1939. I've seen this on mint, untouched radios. Mechanics gradually shift. Some pin is probably catching on something and that's why it doesn't turn to the "receive" position. If you can, just turn the transmitter on one side so you can see the bottom, and while looking through a magnifying glass, turn the mode selector back and fourth GENTLY against the "Empfang" position. Try to see where it's catching. This may be an easy fix. Do not force it.

[rv12p2000]

Hello
On this transmitter the problem is gears

on this type of transmitter gears Céloron deform with time

regards rv12p2000

celeron = phenolic plastic ?