http://elecraft.85.s1.nabble.com/P3-a-modest-proposal-for-QSY-tp5410950p5417413.html
50 Hz is only the accuracy of the readout. Set Span to 2 KHz and
move MKR A ... you will notice it moves with much finer resolution
than 100 Hz steps. With a span of 50 KHz I can see 10 Hz steps in
the frequency sent to the K3 when tapping the select knob. With a
... Joe, W4TV
>
> Fair enough, so lets say that you're within 50Hz accuracy then... That still wouldn't QSY you to the Zero Beat on CW would it.
>
>> From:
[hidden email]
>> Date: Wed, 11 Aug 2010 23:15:02 -0700
>> Subject: Re: [Elecraft] P3: a modest proposal for QSY
>> To:
[hidden email]
>> CC:
[hidden email]
>>
>> My P3 shows a rounded version of what is on the K3 when they are
>> synced. When my K3 says 7.100.000 the P3 shows 7.100.0 when I go to
>> 7.100.050 it goes to 7.100.1 its a rounded version. So when my P3 and
>> K3 are synced (by simply pressing center twice) I can read the
>> frequency on the K3 and know that is the frequency that the P3 is on.
>> I simply set the K3 to 10.000.000 and then do the ref cal on the P3.
>>
>> ~Brett (N7MG)
>>
>> On Wed, Aug 11, 2010 at 11:09 PM, The Smiths<
[hidden email]> wrote:
>>> You're wrong Brett... No matter what you say the P3 doesn't automatically
>>> sync with the K3 to a 1Hz accuracy. The Center line on the P3 CAN be and
>>> usually is off by as much as 99Hz. No matter how you look at it, if you can
>>> move a Center position on the P3 with the select knob in the "CENTER"
>>> adjustment mode, and it doesn't change from the reading of 10.000.0 until
>>> you get up to 10.000.1 or down to 9.999.9 than logic tells you that
>>> SOMETHING is changing between those two positions which just happen to be
>>> 100Hz apart from each other.
>>> Conversely, if you can change the K3 from 10.000.099 down to 9.999.999
>>> before the display on the P3 center line changes, than obviously the K3 and
>>> the P3 are not in sync to the Hz.
>>>
>>> Look, try this.. it's a very simple test. Take your rig, put it on
>>> 10.000.000 Now look at your P3, does it say 10.000.0. Let's say that it
>>> does (according to you it should), now, turn your VFO knob up until the P3
>>> reads 10.000.1. Where is your K3 displaying? I'm sure it's not going to be
>>> 10.000.100. I know mine sure isn't, and that's after I set that center as
>>> close as possible. My rig displays 10.000.042. That's 58Hz off.
>>> Take your VFO move it down until the P3 says 9.999.9. What does your K3
>>> display? Mine says 9.999.940, 60Hz Off. it's NOT accurate. We need the extra
>>> 2 digits in order to set the true Center of the P3 BEFORE doing a Ref-Cal.
>>> You just can't set the Ref-cal until you know the center has been set
>>> correctly. If you do, than you're going to have EVERYTHING out of wack by
>>> that much difference. Moving that Ref cal just confuses things more.
>>>
>>> I'm not over thinking it, on the contrary you're putting your head in the
>>> sand and pretending that the P3's center is following the K3 with 000Hz
>>> accuracy. When you center that marker and hit the QSY button you are going
>>> to move the CENTER of that carrier on the display as far or as close to the
>>> center that you just calibrated it to.
>>> You're just wrong.. I'm sorry. I don't know why Alan hasn't just come on
>>> here and said so... I've already seen 3 posts from him since we've been
>>> discussing this.
>>>
>>> The only people that this isn't important to are SSB guys that don't mind
>>> coming within 100Hz of the QSY freq. I don't know if you do CW, but I do,
>>> and when I land 80 hz away from someone with my 100 Hz filter on it makes a
>>> difference. The P3 was designed with SSB guys in mind, NOT cw guys. The
>>> accuracy of the center display, and the tremendous warm up drift all
>>> indicate it.
>>> I love my P3, and I'm having fun with it, but if Alan wants to make this
>>> friendly to the CW guys that requires more accuracy than the SSB guys use.
>>> He's going to have to 1 - re-write the manual on how to set up the Center,
>>> then the Ref-cal alignments, and then 2 - add the extra 2 digits to the
>>> center display freq.
>>> This is NO different that putting your K3 on 10.000.000 and setting up the
>>> Zero beat on your Config: Ref Cal. You just wouldn't do it that way if you
>>> didn't know that your K3 wasn't parked at exactly 10.000.000.
>>>
>>> You can disagree all you like. I've made my point, shown my facts, and I'm
>>> not going to argue any further on the reflector. Feel free to contact me
>>> off the reflector if you need me to explain further. That goes for Alan as
>>> well, I would love to talk with you and explain what's going on here if my
>>> explanation doesn't make sense to you.
>>>
>>>
>>>
>>>
>>>> From:
[hidden email]
>>>> Date: Wed, 11 Aug 2010 21:53:07 -0700
>>>> Subject: Re: [Elecraft] P3: a modest proposal for QSY
>>>> To:
[hidden email]
>>>>
>>>> The P3 is centered on the K3 by default. Thus you can read the K3 to
>>>> tell what frequency the P3 is on. It doesn't need the extra precision
>>>> on the P3 display. I didn't read any more than your last post. I
>>>> think you're over analyzing it and making it more complicated than it
>>>> needs to be. Its not that hard to understand whats going on there I
>>>> think most hams would get it. Those who don't get it its probably not
>>>> important to.
>>>>
>>>> ~Brett (N7MG)
>>>>
>>>
>
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