[Lowfer] remote "natural radio" receiver

[Pat Bunn]

The problem is that the audio wire will pick up common mode hum and noise. I definitely  would use a transformer.

 Maybe use cheap shielded TV cable for the audio feed plus the transformer. That's probably cheaper than two wire cable.


Pat
Pat

"Douglas D. Williams" <kb4oer at gmail.com> wrote:

>Hey Pat. No, I'll probably just use some 2 conductor wire for the audio
>feed to the sound card. I think I'll put the battery in my outbuilding and
>a solar panel on the roof to keep the battery charged. Radio shack might
>still sell those little audio isolation transformers for keeping the feed
>wires from carrying all the 60 Hz + harmonics out to the unit.
>
>I need to walk around my property with a portable RS4 just to see if I can
>find a location quiet enough to make this even worth the trouble.
>
>-Doug KB4OER
>
>On Sat, Dec 1, 2012 at 8:49 AM, pbunn <pbunn at matrixei.com> wrote:
>
>> Doug
>>
>> Are you going to run coax to the receiver? If so, you can use the coax to
>> feed the power from a battery. Rg6 is cheap and bury able . I'd put a
>> couple if common mode chokes in the kine also. They made more difference in
>> my receiving installation than anything I have done.
>>
>> Pat
>> N4LTA
>>
>> "Douglas D. Williams" <kb4oer at gmail.com> wrote:
>>
>>
>> Years ago I built several of Michael Mideke's RS4 natural radio receivers.
>> I'm thinking of dismantling one of them down to the circuit board,
>> enclosing it in a waterproof box, and installing it on a mast perhaps 100'
>> from my house. I'll still get a lot of hum, but it might let me hear the
>> occasional whistler, dawn chorus, or other interesting signal from the
>> comfort of my house.
>>
>> I've been checking around, and 12v batteries and weatherproof solar
>> chargers seem to be everywhere these days, probably because so many folks
>> are installing solar lighting, hummingbird feeders, and game cameras.
>>
>> The RS4 has a very low current draw, and a mic or line level (not headphone
>> level) output, so it should be a good match for the mic or line level input
>> of a computer sound card. What I don't want to do is carry the 60 Hz hum
>> from the house to the remote RS4 via the sound card connection. What do you
>> guys think is the solution? Perhaps a couple of 1:1 audio
>> isolation transformers....one in the house and another near the RS4? Also,
>> anyone know of a source of inexpensive, buriable 2 wire cable?
>>
>> -Doug KB4OER
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