[Elecraft] Re: K3 RX performance (tantalizing preview)

[N2TK, Tony]

How does Yaesu do it with the FT9000? You can listen on the second receiver
while simultaneously operating transceive on the other receiver/transmitter
on another band while transmitting?
N2TK, Tony 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Scott Manthe
Sent: Monday, May 14, 2007 11:49 AM
To: Elecraft at mailman.qth.net
Subject: [Elecraft] Re: K3 RX performance (tantalizing preview)

One reason is called the inverse square law.
There's a HUGE difference in a rig being able to deal with a kilowatt signal

a couple blocks away and being able to deal with a kilowatt signal in the 
same room. 

Another is that almost everyone who doesn't want to destroy their rig's 
front-end uses giant bandpass filters in front of each rig in a SO2R setup. 

Including eleven of these filters to cover all the bands the K3 will cover 
would make it the size of a broadcast transmitter. For reference for the HF 
challenged, take a look at a good set of repeater duplexers. Now, multiply 
that by eleven bands. 

It's one thing for a 2 meter/440 rig to be able to transmit and RX at the 
same time- they're running maybe 50 watts at 300 mHz spacing. It's not so 
easy with a rig running 100 watts, a kilowatt, or at some stations, several 
kilowatts at 2 or 3 mHz spacing. 

Hopefully this helps. 

73,
Scott, N9AA 


Bill Coleman writes:
> Question: 
> 
> If the K3 can do this, then why can't it do SO2R in one box? All that  is 
> required is for the second receiver to be able to receive (likely  on a 
> different band) while the transmitter is transmitting. 
> 
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
> Quote: "Not within a thousand years will man ever fly!"
>             -- Wilbur Wright, 1901 
> 
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