Hi John (KB2HUK):
I do not agree with putting in an Inrad filter at the 1.8 position. I am
assuming that the 1.8 position is the 1st intermediate frequency of the
receiver. The reality is it is a trade off. By not limiting the bandwidth near
the input of the radio, you are allowing your front end to be overloaded when a
high power signal is nearby. To compensate for this, you can use a broad band
roofing filter say for 6 or 8 KHz which is plenty wide and would minimally
reduce sensitivity if at all. But if the ham "down the road" turns on his high
power linear 300 Hz away from the signal you are working on CW a narrow roofing
filter will prevent the front end of your receiver from overloading. Yes you
have reduced your sensitivity a bit but you can probably dig the signal out
just fine. If you put the filter in the next stage of the reciever, you will
overload your fron end and your AGC will be overloaded and reduce your
sensitivity anyway.
The engineers at TenTec have thought of this and designed the Orion
accordingly. Now Icom and Yaesu have announced that they have put in roofing
filters in the high priced rigs. Why? Think about this please.
Sincerely,
Jim
NC9J
-----Original Message-----
From: brazos@rochester.rr.com
To: tentec@contesting.com
Sent: Sun, 22 Oct 2006 4:51 PM
Subject: [TenTec] Have questions
Hello , I am currently saving for a nice Orion 1 . I am tiring to get a handle
on what to look for on the used market. I have heard that a radio with all the
optional roofing filters installed actually desensitizes the radio and may not
be any kind of an advantage , and that the slick operator puts in a Inrad
filter
at the 1.8 position and this allows closer in sensitivity ? can you advise?
Am
I close ? soooooooo confused ! thanks John kb2huk
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