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M5WJF > WLAN 07.05.05 07:28l 81 Lines 3662 Bytes #999 (0) @ WW
BID : 610626M5WJF
Read: GUEST DG8DG DK5RAS DO6NP
Subj: Re: RE packet vs WiFi
Path: DB0FHN<DB0RGB<DB0AAB<F6KFT<DB0GE<DB0ZDF<DB0LJ<DB0RES<ON0AR<GB7ESX<
GB7MAX
Sent: 050506/2317Z @:GB7MAX.#28.GBR.EU #:5720 [Bloxwich] $:610626M5WJF
From: M5WJF@GB7MAX.#28.GBR.EU
To : WLAN@WW
Wolf OE7FTJ wrote:-
> No, thats wrong! You have to meet the technical conditions about
> rf-bandwidth, max pep, etc. when using as an amateur radio equipment!
> So it is not simple to use a wifi device as an pure amateur radio dev. :-(
Well, as Andy GM7HUD as already stated, I am quite correct regarding the
WiFi situation within the UK on 13cms, and websites like this may be of
some interest to you Wolf:-
http://www.frars.org.uk
For those without Internet, here's the gist of the page regarding
experimentation with a 2.4GHz 20 Watt PA:-
The tests for this unit were carried out by Andy - G4JNT. I'd like to
thank Andy for his tests.
These PA units were found at a UK rally this year for the sum of 18 UKP
each! A bargain if I may say so.
The version with a 9 pin connector has the following connections :
Pins 1 , 6 +12.6V
Pins 2 , 7 Gnd
Others, signalling and control, not identified yet.
At 13.8 Volts, the current consumption is quiescent 6A, The DC supply to
devices inside, 9V on drains of PA indicating some sort of active
regulator circuit inside, but we couldn't see where the 3V at high current
is dropped - must be a resistor hidden under the PA, probably for Id.
monitoring. Bias on the PA devices is -2 V and very likely active biassing
is in use, so the suply range of 12.6 +/-0.3V is a dissipation issue in
the regulator rather than RF device limit. Would have thought the lower
limit could be less with 9V Vd, need to test this.
RF Tests: 2.4GHz, Drive 6dBm (4mW) gives greater than 6W output, and with
increasing drive, we saw power up to 14 Watts. In fact briefly tested to
around 20 Watts output but as my load is only rated at 3 Watts and the PA
was drawing 11A didn't keep it there for long ! At 2.32 GHz, gain is 3dB
lower needing 8 - 9dBm for >6 Watts , but the same power output is
possible, in fact I may have even seen slightly more during a quick test
at 20W. Current for a given power was marginally higher, but only by 0.4A
or so. So it looks as if most of the gain is falling off in the low power
driver stages rather than the PA itself. which is just slightly less
efficient at this freq. Current stays at 6A to around 5 W output
indicating linear class A operation to this point, then increases above
this figure as the PA operates in class AB.
---------------------------------------------------------------------------
Obviously the restrictions within Austria may be different, perhaps it's
worth checking with your telecoms authority to make sure you can't make
use of such equipment?
73 de Wayne M5WJF@GB7MAX.#28.GBR.EU
Tower PC : AMD Athlon XP 2200+ 1GB DDR
Windows XP Professional SP2
Packet Software : WinPack-Telnet V6.80
TELNET Link : 1Mbps ADSL / 56kbps PSTN
Message timed : 00:17 on 07 May 2005
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