[NLRS] strengthening 5760 MHz transverter

[Chris Elmquist]

I would expect a _proper_ 5.7 GHz WiFi (802.11a) rig to be pretty linear.

802.11a uses 256-QAM OFDM modulation and therefore has a pretty high
bar for linearity else the EVM (constellation quality) really starts to
degrade and then so does the bit rate.

On the other hand, I'm not sure of the legality of these things for
the average Joe (non-ham, non-licensed) user and therefore might be a
little suspecious of the vendor's claims.  There's no legal market for
them and so nothing to force them to build it right either.

https://www.law.cornell.edu/cfr/text/47/15.204

15.204(a) and (d) are of particular interest...

Chris NØJCF

On Sunday (04/10/2016 at 02:18PM -0500), Zack Widup wrote:
> 
> 
> It might be OK but that noise figure isn't very good for weak-signal work.
> I built a preamp that has less than 1 dB noise figure. Also, I'm wondering
> what class the power amp runs in. If it's Class A you're good. If it's
> Class C, it wouldn't work well on SSB.
> 
> 73, Zack W9SZ
> 
> 
> On Sun, Apr 10, 2016 at 1:55 PM, John Toscano <tosca005 at umn.edu> wrote:
> 
> >
> >
> > I have a Down East Microwave transverter for 5760 MHz, but it is a "budget
> > model" with the high gain low noise preamp and 2 watt PA section "cut off".
> > I got to wondering if something like this WiFi booster would work if put
> > between the transverter and feedhorn:
> >
> > http://www.amazon.com/2015-Sunhans-Wifi-Signal-Booster/dp/B00N72QWDC
> >
> > Brand Name:Sunhans
> > Model Number:SH58Gi2000
> > SKU:0305SH100025
> >
> > Product:5G /5.8 GHz wifi signal booster
> > Features: 2000mW
> > Operating Range: 5.15-5.85 GHz
> > Operating Mode: Bi-Directional, TDD
> > Transmit Gain: 15-18 dB
> > Rx Gain: 11-14dB
> > Frequency Response: +/- 1dB
> > Output Power: 2000mW
> > TX Input Power: 1 mW (0dBm) min up to 100mW (20dBm) max
> > Receiver Gain: 12 dB Typical
> > Noise Figure: 3.5 dB Typical
> > LED Indicators: GREEN: Solid On: Power and Receiving mode/Off: No Power
> > BLUE: Blinking: Transmitting
> > Connectors: Input: RP-SMA (F), Output: RP-SMA(M) 50 Ohm
> > Lightning Protection: Direct DC Ground at antenna
> > DC Surge Protection: 12V1A
> > Operating Temperature: -40°C to + 70°C
> > Booster Weight: 0.11kg
> > Package Weight: 0.4kg
> > Product Size: 8.4*5.4*2cm
> > Package Size: 21.2*13.5*5cm;
> >
> > Packaging Details
> > Unit Type:piece
> > Package Weight:0.600kg (1.32lb.)
> > Package Size:22cm x 14cm x 5cm (8.66in x 5.51in x 1.97in
> >
> > It appears that it is a 3.5db noise figure 11-14db gain preamp on receive,
> > and a 15-18db gain power amplifier (from which I imagine that 100mW in
> > would yield 1-2 watts of power output). I assume that it must auto-switch
> > between receive and transmuit since it is designed to connect to the
> > antenna port of a wireless access point. I suppose for $90 I could just buy
> > one and try it, but wonder if someone sees a "fatal flaw" that I am missing
> > that would doom this to failure.
> >
> > 73 de W0JT/5
> > EL09vu
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-- 
Chris Elmquist