[SI-LIST] Re: High frequency transmission
- From: Paul Levin <levinpa@xxxxxxxxxxxxx>
- To: Raymond.Anderson@xxxxxxx
- Date: Thu, 18 Dec 2003 10:18:16 -0800
Dear Kirti,
Did you need the power at the other end, or did you need the signal? If the
latter, you might want to consider a analog fiber optic link. You should be
able to send the signal with less than one dB of optical attenuation, hence
quite respectable signal to noise ratio. Further, your EMI and ground to
ground problems are history!
Regards,
Paul
__________________________
Raymond Anderson wrote:
> Kirti Barpande wrote:
>
>
>>Hello! Experts,
>>I want to transmit a 500 MHz sinusoidal signal, 2 to 3 volts peak to peak
>>over 300 metres long coaxial cable. Can it be successfully done with minimum
>>loss using coaxial cable? Which cable will be more suitable? I Plan to use
>>RG-8 cable.
>>Kirti
>>
>>
>>
>>
>
> RG-8 (Belden 9913) has a loss of 3.02 dB/100 feet at 500 MHz
> RG-8 (Belden 8237) has a loss of 4.8 dB/100 feet at 500 MHz
>
>
> For a matched cable 300 meters long you will have the following losses:
>
> Belden 9913: -29.75 dB or a voltage ratio of .0316
> Belden 8237: - 47.27 dB or a voltage ratio of .0043
>
> Since dB=20log (V1/V2)
>
>
> So your output voltage will be about (3*.0316) 0.048 volts for 9913 cable
> or (3*.0043) 0.0129 volts for 8237 cable.
>
> Exotic rigid heliax like Andrew LDF6-50A would give you about 9.57 dB loss
> or abour .94 volts at the end of your cable (at a cost of many $$$$/meter)
>
> Bottom line: 500 MHz over 300 meters of coax can't be done with low loss!
> (at least with commonly available cables)
>
> Ray Anderson WB6TPU
> Staff SI Engineer
> Sun Microsystems
>
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--
Paul Levin
Senior Principal Engineer
Xyratex Storage Systems
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