Re: [IRCA] Technical Review: CCrane CCRadio-EP AM/FM AnalogPortable Radio (loopstick Litz)

[george magiros <submodd@xxxxxxxxx>]

Sorry about that I didn't read further.   I guess they don't want to pay for
the patent.  From what I understand you want each coil to output a 180
degree out of phase signal from each other for the patent.   Maybe you can
still get a better Q by having separated coils instead of one big one.
George

On Wed, May 25, 2011 at 10:04 PM, george magiros <submodd@xxxxxxxxx> wrote:

> I do like his patent for the twin coil.  Very readable and he even goes
> into the design of his preamp.  Going by your description of the radio it
> sounds like it uses the circuit in figure 7 so it can use a varactor to
> tune.   Figure 4 is I guess the more pure version of the antenna circuit
> with a variable capacitor.
> http://www.google.com/patents/about?id=h4EOAAAAEBAJ
> George
>
>
>
> On Mon, May 23, 2011 at 7:58 PM, Steve Ratzlaff <steveratz@xxxxxxxxxxxx>wrote:
>
>> Hi Gary,
>> Thanks for reminding me.
>> I didn't mention it in my review, but the Litz used on the EP radio's
>> loopstick appears to be decent. It's quite fat in diameter compared to the
>> usual tiny Litz found on the usual portable radio loopsticks. Purely
>> guessing, but I'd guess the EP loopstick Litz is something like 100/46,
>> perhaps larger. (100 insulated strands of #46 gauge.)
>> Steve
>>
>> ----- Original Message ----- From: <d1028gary@xxxxxxx>
>> To: <irca@xxxxxxxxxxxxxxxx>
>> Sent: Monday, May 23, 2011 4:07 PM
>> Subject: Re: [IRCA] Technical Review: CCrane CCRadio-EP AM/FM
>> AnalogPortable Radio
>>
>>
>>  Hello Steve (and all),
>>>
>>> Thanks for the excellent CCRadio-EP technical review, Steve.
>>>
>>> Tecsun apparently first introduced this two Litz-wire lead, multi-section
>>> loopstick coil system in the PL-310 Ultralight model, and has continued it
>>> in the PL-380 and PL-606 models. Why the Chinese factories have come up with
>>> this loopstick coil arrangement is a mystery, since simple replacement of
>>> the Chinese Litz wire (on the same ferrite bar) with higher-quality 40/44
>>> Litz wire in a single coil (of the same inductance) willl always result in a
>>> dramatic signal improvement on both the MW and LW bands in all these radios.
>>> I don't know if the same would hold true in the CCRadio-EP, but if the Litz
>>> wire is like that in the Tecsun ULR models, this simple $5 modification
>>> would be worth a try.
>>>
>>> 73, Gary
>>>
>>>
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