http://elecraft.85.s1.nabble.com/K3-RF-Gain-Squelch-tp4289745p4292121.html
DSP). If you encounter AM stations that are strong and are on adjacent
that mode. Your 6 kHz filter is NOT a 'waste' after all.
David Y. wrote:
> Don and All,
>
> Your last post raises a question in my mind--it probably has been
> discussed before, and if so, I missed it. I must admit that the
> number of posts on this reflector is often overwhelming, and I'm sure
> I get too quick with the delete key.
>
> Here's the question--I bought the 6 khz filter, but not the 13 khz
> filter. I don't do AM, and probably won't do much, if any FM, but I
> suppose the possibility is there for a very small amount of FM on 10
> meters perhaps. Anyway, I bought the 6 khz filter, primarily to
> accomodate any SW listening I might do. So, would I have been better
> off to buy the 13 khz filter instead of the 6 khz filter? That sounds
> like what you did. I assume I could just use the 13 khz filter for AM
> listening, and use the DSP to narrow things appropriately. I wouldn't
> have a 6 khz roofing filter, but would I really be at much of a
> disadvantage for the type of use I describe above? For some reason, I
> thought the 6 khz filter was mandatory for AM, but maybe I misread
> that (or misinterpreted what I think I read!).
>
> By the way, your discussion of how to set the RF gain makes a great
> deal of sense to me. It is, in fact, what I have been doing
> intuitively. My RF gain is almost always set at something like 12
> o'clock or so--maybe a tad bit higher. My "excursion range" with the
> RF gain rarely goes beyond the 2 o'clock position, even on very weak
> signals. Beyond that all I seem to be doing is increasing the noise
> level with little or no improvement in the desired signal. I rarely
> use the preamp, and find that it more often than not degrades what I
> am trying to hear.
>
> Dave W7AQK
>
>
> ----- Original Message ----- From: "Don Wilhelm" <
[hidden email]>
> To: <
[hidden email]>
> Cc: "Elecraft Discussion List" <
[hidden email]>
> Sent: Monday, January 11, 2010 10:10 PM
> Subject: Re: [Elecraft] K3: RF Gain, Squelch
>
>
>> Al,
>>
>> To look at it another way - look at the S-meter to observe the band
>> noise level, and then back off the RF gain until the S-meter is steady
>> at that same S-meter reading. Of course, this should be done at a spot
>> in the band where no signals are present.
>>
>> That is a quick way to determine the optimum setting for the RF Gain
>> consistent with the greatest receiver dynamic range and one does not
>> have to listen to the constant band noise clutter.
>>
>> The other option is to just run with "all knobs full right" and put up
>> with listening to the band noise when there are gaps in the signal
>> level.
>>
>> Be aware that the AGC Threshold will also have a great effect on the
>> amount of band noise heard in the audio. If the Threshold is set too
>> low, the receiver will go into AGC action on only the band noise. I use
>> an AGC Threshold setting of 008 just for that reason (I know the default
>> is 005, but I think that is too low).
>>
>> 73,
>> Don W3FPR
>>
>