[Elecraft] Filter problems

[Vic K2VCO]

Make sure the filter gain compensation is set properly for the 250 Hz filter. The easiest 
way to do it is from the filter configuration screen of the K3 utility.

On 3/26/2013 5:44 PM, Jim Miller wrote:
> Just used the K3 utility to disable the 250 8p on the sub and the audio now
> is balanced regardless of sub bandwidth. Of course the noise level changes
> but no imbalance with strong or weak sigs between the two.
>
> Now to figure out if it's the socket or the filter at fault.
>
> jim
>
> On Tue, Mar 26, 2013 at 8:22 PM, Jim Miller <jim at jtmiller.com> wrote:
>
>> I think I've figured out why my subrx seems to be much less sensitive than
>> the main. I was playing around with the bandwidth control today while
>> having the VFOs linked.
>>
>> I have the same filter setup in main and sub, a 2.8K and a 250hz, both 8
>> pole. I have both main and sub set to cut to the 250 at 350hz. I do most of
>> my Dx activity with the BW set to 350 so engaging the 250hz filter.
>>
>> What I noticed is that although the sub is much less sensitive than the
>> main with the 250 engaged it is just fine just above where the filter kicks
>> in.
>>
>> This tells me that something is wrong with the filter or the socket it is
>> in. The balance control has to be set past 3 oclock to even out the signals
>> with the 250 engaged in the sub. The balance is just fine however when that
>> filter isn't engaged.
>>
>> I'm going to try moving the filter to another socket in the sub to see
>> what effect that has.
>>
>> I can also try swapping the 250 between the sub and the main to see if the
>> loss of sensitivity tracks the filter placement.
>>
>> Any other ideas?
>>
>> It could be a bad filter. I don't think the filters should be that
>> different in loss when in spec.
>>
>> jim
>>
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-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/