-=> On 04-02-98  12:47, Brendan Keyport said to Russ Wuertz,<=-
-=>"About 49Mhz to 6m......,"<=-
-=> On 04/02/98 / 12:39:06, Brendan Keyport was babbling to Russ Wuertz
-=> about: Re: 49Mhz to 6m...
 
Hi, Brendan;
 
[Snip]
 
 BK> All the offset is for is repeater use... it's just a way of us being
 BK> able to use the band most effectively. the 600 kHz split, I believe was
 BK> most commonly in use when it was desided that the ARRL needed to come
 BK> up with some sort of guideline to use the band. There may be some
 BK> technical aspect behind it.. Anyway...
 
Actually, there are technical reasons.  At 144-148 MHz, it is fairly easy
to build tuned circuits which will prevent the transmitter's signal from
getting into the receiver and causing it to lose sensitivity.  This is
called "Desensing."  These tuned circuits are called "Cavities."  They
are not coil-and-capacitor tuned circuits, they are hollow cylanders,
usually silver plated on the inside so that they have a minimum loss.
They allow the system to use two antennas very close together, or even
use the same antenna for transmitting and receiving at the same time
without interaction between the transmitter and receiver..
 
 BK> Repeater operation: TX on one frequency to the repeater. Repeater
 BK> TXes on another frequency (at a pre-programed interval) to get your
 BK> signal farther.
 
He may not understand TX and RX.  (For his benifit):  TX is the
abreviation for Transmit(ter), and RX is the abreviation for receive(er).
 
[Remainder snipped]
 
I have no comments about the remainder of what you said.  It is all
correct.  I posted a message to him today which explains the same thing
in much greater detail.  The biggest difference is that I used a
different repeater pair.
 
N7UIE DE KB9QPM 73
   Ivy
 
 
 
... WARNING!!  Sun block wont protect you from RF BURNS...
 
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