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

[george magiros <submodd@xxxxxxxxx>]

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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