[TenTec] Omni VI plus - noise & INRAD filters

[K3BU@aol.com]

jreid@aloha.net writes:

<<  I do get the noise,  whether the antenna input
 terminal to the Omni VI+ is left "open" or terminated in
 50 ohms.  BTW,  the S-meter reads zero deflection.  And,
 yes,  perhaps even in the background,  below or at the level of
 rigs RF stage internally generated noise,  I can hear
 a faint   "whine".  >>


There is a big difference between noise due to the receiver sensitivity (with 
antenna connected) and noise generated internally (antenna disconnected, DSP 
and LP off). Again, what we are concerned (complaining, or trying to improve, 
rectify) is the internal noise generated by the IF stages after the crystal 
filters. This noise is characterized by high pitched noise that is detected 
and amplified by the audio stages (annoying hiss). The possible solutions 
could be adjusting the working parameters of IF amplifiers, or adding 
filtering before the detector. 
The point is, your multi $k rig should be dead (or close to) quiet when 
antenna is not on or ant input is shorted out. 
When you connect antenna and hear noise, you got sensitive receiver (or noisy 
neighborhood). We are not talking about that situation at all. THAT is normal!

Aloha and Sayonara
Yuri, K3BU

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