> Yes, this is enough to hit the spot button, but having the extra two
> digits would be very helpful.
You don't need the extra digits for REF CAL. Simply zero beat your
reference signal on the K3, Hold "CENTER" twice to align the P3 Center
frequency with the K3, then turn on REF CAL and adjust the signal so
it is centered in the display.
P3 REF CAL doesn't care about the frequency of the signal you are
using for alignment. The only thing REF CAL does is to move the
spectrum/Waterfall display so it aligns with the frequency reported
by the K3. You can even use one of those strange beacons on a
"odd" frequency as long as you properly tune the station and do
"CENTER" "CENTER" before adjusting REF CAL.
73,
... Joe, W4TV
On 8/12/2010 12:31 PM, The Smiths wrote:
>
> I agree with you for once Joe... 50Hz sounds right. If you Ref cal from that
> point than you'll most likely be 4 to 5Hz off. I've not once been able to
> get it to 1Hz resolution. Yes, this is enough to hit the spot button, but
> having the extra two digits would be very helpful.
>
>> Date: Thu, 12 Aug 2010 02:58:27 -0400
>> From: li...@subich.com
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] P3: a modest proposal for QSY
>>
>>
>>> 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.
>>
>> You're wrong. The P3 display will never be more than 50 Hz from the
>> K3 if you calibrate it properly. Hold "center" until the "Center
>> Frequency" adjust display comes on and then hold "Center" again.
>> The P3 center frequency will be calibrated to the K3 frequency ...
>> the display will change +/- 50 Hz (e.g. it will show 10.000.0 from
>> 9.999.950 to 10.000.049).
>>
>>> 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.
>>
>> No, the P3 display will change to 10.000.1 at 10.000.050 as I just
>> explained above. The P3 shows the correctly rounded version (not
>> truncated) of the K3 frequency. If you want the P3 center frequency
>> to align with the K3 simply do the "Center" "Center" process as
>> documented in the manual.
>>
>>> 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.
>>
>> If you properly zero the "Center" as instructed in the manual and
>> use WWV or an AM broadcast signal with SPAN set to 2 KHz, you will
>> get REF-CAL set to well less than 0.1 Hz ... probably on the order
>> of 0.01 Hz. It's not rocket science ... just follow the instructions
>> from those who designed the product and stop trying to argue.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 8/12/2010 2:09 AM, The Smiths 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: br...@livecomputers.com Date: Wed, 11 Aug 2010 21:53:07 -0700
>>>> Subject: Re: [Elecraft] P3: a modest proposal for QSY To:
>>>> notforc...@hotmail.com
>>>>
>>>> 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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