[Elecraft] Soon to be an Elecraft(er)!

[Brendon Whateley]

Yes, thank you Matt for the explanation. I obviously didn't think it
through as well as I should have.

- Brendon
KK6AYI

On Fri, Oct 7, 2016 at 12:22 PM, Matt Maguire <matt.vk2rq at gmail.com> wrote:

> Hi Brendon,
>
> In a way you are right, but consider this: the per-band nulling procedure
> is to compensate for amplitude and phase variations introduced in the LO
> and quad mixer which can be different from band to band. However, when you
> put a roofing filter in the signalling path, it will introduce a further
> amplitude and phase imbalance (which as you say will be the same for all
> bands). The per-band nulling parameters you set up before adding the
> roofing filter will all need to be adjusted to take the impact of the
> roofing filter into account. This is why you should repeat the whole
> nulling calibration for each band when you add a roofing filter. Does this
> make any sense?
>
> 73, Matt VK2RQ
>
> _____________________________
> From: Brendon Whateley <brendon at whateley.com>
> Sent: Saturday, October 8, 2016 3:00 am
> Subject: Re: [Elecraft] Soon to be an Elecraft(er)!
> To: Matt Maguire <matt.vk2rq at gmail.com>
> Cc: Elecraft Reflector Reflector <elecraft at mailman.qth.net>, Ray Sills <
> raysills3 at verizon.net>
>
>
>
> Given my understanding of the roofing filter design in the KX3, I don't
> think there is any per-band adjustments to make. IIRC, the filter is an
> analog low-pass filter that operates after the direct down-conversion.
>
> If I'm wrong, then please set me straight. Especially because I'm
> considering adding the filter to my KX3.
>
> - Brendon
>
> On Thu, Oct 6, 2016 at 11:35 PM, Matt Maguire <matt.vk2rq at gmail.com>
> wrote:
>
>> Does the factory do a full per-band calibration, or do they just
>> calibrate on 20m and extrapolate? If the latter I'd suggest to do the full
>> per-band calibration yourself even for a factory-fitted roofing filter, as
>> it does make a difference (obviously back up your config first so you can
>> restore to factory settings/calibration if needed)
>>
>> 73, Matt VK2RQ
>>
>>
>>
>>
>> On Fri, Oct 7, 2016 at 5:38 AM +1100, "Ray Sills" <raysills3 at verizon.net>
>> wrote:
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Also, IF you order the roofing filter for the KX3…. even with a kit
>> purchase…. the factory will calibrate it for you, so all you need do is
>> install the little board.  They have a test jig, so that the filter will be
>> tested with YOUR particular main board.  Best of both worlds… save some
>> money, and get free factory calibration.
>>
>> 73 de Ray
>> K2ULR
>> KX3 #211
>>
>>
>> > On Oct 6, 2016, at 12:00 PM, Walter Underwood  wrote:
>> >
>> > The roofing filters require some calibration. If they are
>> factory-installed, Elecraft does that for you. All the other options are
>> exactly the same whether factory-installed or user-installed.
>> >
>> > wunder
>> > K6WRU
>> > Walter Underwood
>> > CM87wj
>> > http://observer.wunderwood.org/ (my blog)
>>
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>
>
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>