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I agree with Shawn:
The size of an ferrite antenna doesn't matter as much as other issues like internal noise, selectivity, and sensitivity. In fact, having too much antenna can be a burden and lead to overload and too much background noise. And ferrites are way over-rated, give me a 50 long wire antenna pointed in the right direction with a radio with good gain control will easily beat any ferrite on the planet.
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I quite agree with this thought.Having done experiment with ferrites of various size,I observed that best results are possible with stock ferrite only.Infact the designer might have taken all factors in consideration before finalising ultimate size of ferrite.
Posted by: vimal oberoi | August 23, 2012 at 08:22 AM
Ferrite is expensive most radio makers cuts cost down by a small one besides home noise is so great nowadays than having a large ferrite can be a problem, anyway serious AM radios intended for DXing get a big boost by using a large one. I have a home made 12" ferrite radio installed in a Panasonic RF-2800 which outperforms a Panasonic RF-2200 easily but it only shows in low noise environment. With their stock ferrite the Rf-2200 is better than the RF-2800 in AM sensitivity, of course.
Posted by: Huesby | August 23, 2012 at 08:46 PM
I did the same thing with a GE 7-2990 (Panasonic RF-2600 with a different case and dial) with astounding results.
You're right. It actually outperformed a RF-2200.
Of course the plastic tuning gear went bad...a common problem with this model.
I've been thinking of doing the same to an old DX-400. With it's ant trim control on the front and triple
superhet circuit it could be a really hot rig. As it is with an outboard coil (Select-A-Tenna ect) it blows everything else I have away.
Posted by: Drive-In-Freak | August 24, 2012 at 06:00 PM
Here's a shot of the loopcoil...
http://i20.photobucket.com/albums/b218/driveinfreak/GEcoil.jpg
Size does matter, but the circuit that works with it is just as important. Also if you should change the coil stick you have to re-tune the circuit (adjust the coils and caps) so it will match.
Posted by: Drive-In-Freak | August 24, 2012 at 06:09 PM
Drive-In-Freak:
If you are the same guy who posted those pictures in Antique Radio Forums a long time ago then you have to know that it was your work which inspired me to make my mod with my radio and for that I need to thank you very much because it was the beginning to a journey of radio experimentation which has brought me a lot of knowledge.
Huesby
Posted by: Huesby | August 24, 2012 at 06:26 PM
Yep, that's me, and you're quite welcome. I'm thrilled it was of some use to someone.
Posted by: Drive-In-Freak | August 28, 2012 at 07:07 AM