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Re: [Discuss-gnuradio] to prevent damages
From: |
michael taylor |
Subject: |
Re: [Discuss-gnuradio] to prevent damages |
Date: |
Wed, 27 Sep 2006 10:21:46 -0400 |
On 9/27/06, Brian Padalino <address@hidden> wrote:
It might not be a bad idea for Ettus Research to also stock some other
items such as SMA cables/adapters/attenuators.
Attenuators might a good idea. I think a model to match the 100mW
transmitters would be Mini-Circuits' VAT-15 (50 ohm, SMA, 1W, 15dB,
usable up to 4GHz) if I've done my loss calculations correctly
<www.mini-circuits.com>. A 9 or 6 dB for the BasicTX should be usable
if I haven't messed up my calculations.
It might also be handy to have some nice block diagrams with max power
recommendations and recommended attentuations for cabled setups as
well as a table in the Wiki with such recommendations.
Here is what I think the calculation is:
transmit power converted to dBm (1 dBm == 1 mW) minus the attenuator
loss = output power in dBm.
E.g.
100 mW -> 20dBm
20dBm - 15 db att = 5 dBm
5 dBm -> 3.2 mW
So if the receiver can handle 3.2 mW input, this would be adequate
attenuation. Off hand I don't know what is acceptable input power
range.
dBm ref: <http://en.wikipedia.org/wiki/DBm>
That might save some of the more software oriented people from burning
out their hardware without intentionally doing so.
Agreed.
- [Discuss-gnuradio] to prevent damages, Vincenzo Pellegrini, 2006/09/27
- Re: [Discuss-gnuradio] to prevent damages, Brian Padalino, 2006/09/27
- Re: [Discuss-gnuradio] to prevent damages,
michael taylor <=
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., John Gilmore, 2006/09/28
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Berndt Josef Wulf, 2006/09/28
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., John Ackermann N8UR, 2006/09/28
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Daniel O'Connor, 2006/09/28
- Re: Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Brian Padalino, 2006/09/28
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Daniel O'Connor, 2006/09/28
- Re: Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Brian Padalino, 2006/09/28
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Berndt Josef Wulf, 2006/09/28
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Daniel O'Connor, 2006/09/28
- Re: [Discuss-gnuradio] to prevent mental damages, avoid dB's., Berndt Josef Wulf, 2006/09/28