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 Kriesler Aerial Coil.
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 Return to top of page · Post #: 1 · Written at 7:23:43 PM on 9 July 2012.
Zamiac's Gravatar
 Location: Tynong North, VIC
 Member since 9 April 2009
 Member #: 464
 Postcount: 37

Hi to All,
I need a B/C band aerial coil for an old 11-9 it looks as though a coil from any of the 11-** series would suit , will consider buying a junk radio to get the coil. Thanks
Regards John.


 
 Return to top of page · Post #: 2 · Written at 6:58:54 AM on 10 July 2012.
Wa2ise's avatar
 Location: Oradell, US
 Member since 2 April 2010
 Member #: 643
 Postcount: 737

Sometimes, the old rosin from the terminal lug solder connection to the fine wire of the coil will corrode through the wire, making an open circuit break next to the terminal lug. Of course if it looks like lightning fried it, forget that...

Next step is as you mention, an exact replacement. Failing that, if the donate radio and your radio has the same capacitance antenna section tuning cap, you can use that coil. You have to tweak the antenna tuning cap trimmer for max signal at a station around 1400KHz.

I've used loopstick antennas salvaged from dead transistor radios as a replacement. These have a secondary coil that fed the transistor converter circuit, which can be repurposed as an antenna input. However, the main section of the loopstick coil will have too much inductance, so, after installing it into your radio (see what the connections were in the transistor radio were, which wire went to ground, which to the tuning cap, and which formed the secondary). To reduce inductance you'll either or both remove the ferrite core from the coil, or strip off turns of wire from the lead that feeds to the tuning cap. To get the correct new inductance, tune in a station near the low end of the AM band, and slide the ferrite rod or remove or add turns of wire while observing the station signal strength.


 
 Return to top of page · Post #: 3 · Written at 2:40:05 PM on 10 July 2012.
Zamiac's Gravatar
 Location: Tynong North, VIC
 Member since 9 April 2009
 Member #: 464
 Postcount: 37

Hi Wa2ise,
Thanks for your info. this coil looks rat eaten as does the rest of the radio , they tried all of the caps. some were entirely gone apart from the pigtails they stripped the paper off of the electros. and chewed on the mica caps. I will try to get an original coil or similar . The ferrite rod solution might be difficult to implement due to lead lengths it is a dual band radio .
Cheers John.


 
 Return to top of page · Post #: 4 · Written at 4:10:39 PM on 10 July 2012.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3947

Looking at the circuit, as I do not think I have an 11/9 but know where one might be, to look at.

It would appear the the two aerial coils are individuals and the oscillator is a single former with both coils on it.

It uses the Philps ECH35 as a mixer oscillator. Once some of those coils etc. have become ratatouille there is little hope other than replacement.

If the worst comes to the worst you can get universal replacements that may work.

Marc


 
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