Warning about hyperlinktech.com

To all those people who are considering buying a junk HyperLink amp please
visits my website before you waste your money.

http://www.junkamps.com

Let me know if anyone else has this same problem.

Thanks,
Steve.

Junk Hyperlink Amps wrote:
> To all those people who are considering buying a junk HyperLink
> amp please visits my website before you waste your money.
> http://www.junkamps.com

> An 802.11b/g HyperLink amp will cost you up to $1000 each.

That much? Why get HyperLink amp at that price when you could get
Teletronics SmartAmps for about $250-400 for 11b (from fab-corp.com or
Electro-Comm) and presumably not much more for their 11g amp.
Plus the Teletronics SmartAmps would have constant power output.

> I have bought close to a hundred 802.11b amplifiers and many of them
> were from HyperLink.

How many were HyperLink and, of those, how many had problems?
How about the Teletronics amps, how have they been?

By the way, I was surprised that there was such a thing as an
11g amp, distinct from an 11b amp. I thought that a 2.4GHz amp
is a 2.4GHz amp---it shouldn't matter whether the signal being
amplified is an 11b or an 11g signal.

According to the Teletronics salesman, the reason they have a
an amp specifically for 11g is that 11g is more demanding of
amplifier linearity than 11b. Is this answer correct?

I assume that an 11g amp will work for amplifying 11b (though be
overkill in design), whereas an 11b amp may not be quite up to
snuff for amplifying 11g, yes?

Just so people no AMPS are generally a bad choice and should not be
used. They will tend to cause many more problems than they solve
without a very strong knowledge of the theory involved and using best
practices for RF equipment.

Because the 802.11 equipment operates in a half duplex mode the
amplifiers can cause problems in the following way. If you are in a
high RF noise enviroment the amplifier can get stuck in either the TX
or RX mode and not switch fast enough between them to function
properly. The time required to switch modes is well under 1ms and this
causes problems. The amplifiers are not smart and cannot tell if they
are receiving the intented signal or a signal from another device.
They can also be completly killed by a 2.4 ghz cordless phone as the
phones tend to send a more constant signal.

Best case is to not use an amplifier but use a higher gain antenna.
The higher gain antenna offers a more narrow beamwidth and this
translates into an improved signal to noise ratio. The downside of
course is the narrow beamwidth limits the nodes that can receive a
signal to specific area.