the power supply "wallWart" that came with this one was 5volt 1.4amp. ya need a picture?
and you have your own answer if you were to look at the pdf you keep posting on how you can get that mutch power.
Under :
Table 3: Operating Ranges
Rf Out Put Power (TYP) 28dbm @5.0v = 28 dBm = 630.95734448 milli watts
looks like this :
1mW with a gain of 28.00 = 630.95734448mW
so now if we Turn up the input this is what it will look like this:
1.99526mW with a gain of 28.00 = 1259mW
NOTE
**The device may be operated safely over these conditions; however, parametric performance is guaranteed
only over the conditions defined in the electrical specifications.**
As you see here it can do ALOT more than I am doing with it!!!
1.JPG
Description:
As you see here it can do ALOT more than I am doing with it!!!
Joined: 06 Jun 2006 Posts: 3763 Location: I'm the one on the plate.
Posted: Sat Jul 25, 2009 16:43 Post subject:
Radioman193 wrote:
the power supply "wallWart" that came with this one was 5volt 1.4amp. ya need a picture?
Do I need a picture ? I wish you hadn't, because you have the gayest looking wart I've seen in a long time.
Radioman193 wrote:
Rf Out Put Power (TYP) 28dbm @5.0v = 28 dBm = 630.95734448 milli watts
looks like this :
1mW with a gain of 28.00 = 630.95734448mW
You erroniously equate the 28 dBm Rf output of the amp with 28 dB of Rf gain. These are not the same concepts. In reality, you have no idea what the gain of the amp is, and the spec sheet does not give it. There is no need to blow smoke up my ass with mis-information, and as a class 1 radio operator you should know your deeBeez better. Be that as it may, I have no doubt that the chip has a potential of 1W +. If you read my wattage query again you will notice that I asked how the DD-WRT GUI was guessing the wattage value. I expressed no doubt that it can or is producing over a watt of output. Notice also the quoted info below my question about the radio not being conscious of the RF final. That is why I question the GUI's wattage value.
Here is a picture of my power wart. The 35 or 40 radios I purchased before the lawsuit all have these warts. I have not purchased any more buffalo radios since they started re-selling, nor do I intend to purchase any more. Engenius and Ubiquity have won the radio battle. Also, a chart of the measured output of a stock HP radio ( with DD-WRT V23 SP1 ), so it is easy to imagine a lot more wattage potential with an extra volt or more of B+.
Joined: 06 Jun 2006 Posts: 3763 Location: I'm the one on the plate.
Posted: Sat Jul 25, 2009 20:49 Post subject:
Radioman193 wrote:
1.99526mW with a gain of 28.00 = 1259mW
Radio output power like all other electronics is bound to the ohm's law. You needn't guess at the theoretical maximum. Simply calculate it using the values that you know. The Wattage potential of a single element PA can be calculated using the 50 ohm output impedence and the voltage available to the amp.
5.5 volts volts across a 50 ohm load dissipates .605 watts of power. _________________ http://69.175.13.131:8015 Streaming Week-End Disco. Station Ripper V 1.1 will do.
Last edited by GeeTek on Sat Jul 25, 2009 20:58; edited 1 time in total
Joined: 06 Jun 2006 Posts: 3763 Location: I'm the one on the plate.
Posted: Sat Jul 25, 2009 21:04 Post subject:
Radioman193 wrote:
the facts as you turn your drive power up your output will go up.
Yes indeed, but only to the point that the amp saturates. The drive level of the saturation point is defined as the drive level required for maximum output. More drive than that produces clipping and wave distortion, but no more power out.
Radioman193 wrote:
and Rf power is NOT the same as Raw Voltage.
If you are claiming that RF does not obey the ohm's law then my conversation with you has come to a screeching fucking halt. _________________ http://69.175.13.131:8015 Streaming Week-End Disco. Station Ripper V 1.1 will do.
and as for the picture its a bad day if you go by the spec. you see in Ebay.
off a person with only 306 feedbacks and is selling "Referb" Routers.
That ARE NOT referbs as thay have no SER#
and the original factory build date sticker still over the screw.
and the condition of the router looks like it was tossed in a dryer for 2 days then buried in the back yard for 6 months then sell it on Ebay for $44.99
A REFERB would NOT be in that condition.
Im Not here to teach rf theory nor am i here to teach a Electronics class.
Joined: 06 Jun 2006 Posts: 3763 Location: I'm the one on the plate.
Posted: Sat Jul 25, 2009 21:52 Post subject:
Radioman193 wrote:
do what you must do.
Ya just dont Calculate it the same way as RAW voltage.
Of course you do, and all of the figures you just posted agree with the ohm's law, and the dBm claculator link you provided confirms that RF adheres to the ohm's law. I'm not sure what you seem so confuzed about since your values are correct. Why you only have a range of 2 feet with a 250 mW transmitter and a 2 dBi antenna is an area of concern that you really should investigate !
Radioman193 wrote:
24dBm = 250mW
50 ohms
you will get 3.544volts
so doing it your way you would only have
0.2512watt
and with a 2dbi antenna you would get about 2 Foot range.
250 mW = .2512 watts (approx). So where is the mistake you infer to ?
Joined: 06 Jun 2006 Posts: 3763 Location: I'm the one on the plate.
Posted: Sat Jul 25, 2009 22:05 Post subject:
It is simple enough to design an RF amp stage with a much lower output impedence and then use a transformer to match it to a 50 ohm antenna load. This is how you can make a 100 watt CB linear with a single transistor.
Unfortunately our little wifi amp in this buffalo radio has an internal 50 ohm pad that would preclude you from using this method to juggle the wattage higher with external transformation. _________________ http://69.175.13.131:8015 Streaming Week-End Disco. Station Ripper V 1.1 will do.
Joined: 06 Jun 2006 Posts: 3763 Location: I'm the one on the plate.
Posted: Sat Jul 25, 2009 22:28 Post subject:
GeeTek wrote:
Also, a chart of the measured output of a stock HP radio ( with DD-WRT V23 SP1 ), so it is easy to imagine a lot more wattage potential with an extra volt or more of B+.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=22201&highlight=
Looks like I was mistaken on the firmware version. His rectum spannalyzer was also being a bit genereous with it's wattage readings if his RF final indeed only has 4.5 volts available. _________________ http://69.175.13.131:8015 Streaming Week-End Disco. Station Ripper V 1.1 will do.
Joined: 06 Jun 2006 Posts: 3763 Location: I'm the one on the plate.
Posted: Sat Jul 25, 2009 23:24 Post subject:
Radioman193 wrote:
I use my Praxsym PM-2458 and on that i get "With TX set to right"
31dbm @ 1248.5mW with a 7dbi antenna on it
"With TX set to Left" i get
31dbm @ 1250.1mW with a 7dbi antenna on it
Remember i have 2 Ext. antennas on it
Are you connecting the meter from one port to the other when you change from left to right in the software ? If so, then that is an impressive reading. It would be better to use a dummy load instead of an antenna, but it is still interesting. If you are connected to only one port and switching the antenna in the software does not change the reading on the meter then please do post back saying so. I have used these radios extensivly, including on multi-mile links, and I assure you that with the firmware I use, the software switching of the antenna is effective. _________________ http://69.175.13.131:8015 Streaming Week-End Disco. Station Ripper V 1.1 will do.
)
Are you connecting the meter from one port to the other when you change from left to right in the software ? If so, then that is an impressive reading. It would be better to use a dummy load instead of an antenna, but it is still interesting. If you are connected to only one port and switching the antenna in the software does not change the reading on the meter then please do post back saying so. I have used these radios extensivly, including on multi-mile links, and I assure you that with the firmware I use, the software switching of the antenna is effective.