Sync AM and checking VFO accuracy using WWV

[Ken Arck]

I calibrate all my rigs with the WWV/spectrum display software method
and it's never gotten me in trouble! From my K3s to my TS2000 to my
FTDX3000, they all are dead nuts on thanks to this easiest of methods!

Ken


At 01:22 PM 12/18/2016, ab2tc wrote:

>Hi,
>
>Boy, this thread is now incredibly long and I am not sure it if I want to
>risk sticking my neck out with another entry. But I will.
>
>There has been an intense debate for at least the past 8 years as to what
>constitutes the "best" way to adjust the reference oscillator to the best
>accuracy. Why not just stick with the "Zero beating" (Method 2) described in
>the manual? All it requires is clear reception of WWV at the highest
>frequency possible. No other instrumentation like a PC spectrum analyzer
>program or frequency counter is needed. As for accuracy, the only possible
>weakness I can see is the accuracy of the K3 audio side tone, but there is
>no reason why this should not be accurate to a fraction of the Hz. Barring
>that the method is perfect. (The expectation that the PC spectrum analyzer
>is any more accurate is dubious). Aw, forget about Doppler shift in the WWV
>signal. Under normal ionospheric conditions it's negligible.
>
>AB2TC - Knut
>
>PS. I would also describe the sound heard at near zero beat as
>"whump-whump-whump" or "wow-wow-wow", but certainly not "chirp-chirp-chirp".
>And I agree with the comments below.
>
>
>k6dgw wrote
> > There are a myriad of ways to do it if you're interested, however don't
> > underestimate the accuracy you can achieve with your ears and ability to
> > count when you get the levels equalized.  If you count 6 noise peaks in
> > 60 sec, you're within 0.1 Hz.
> >
> > Something that hasn't been mentioned [and that I only alluded to in a
> > previous post] is doing this during the tone-free minutes on WWV.  The
> > tone modulation can make it very difficult, and in some cases your
> > result can be off by the frequency of the tone.
> >
> > 73,
> >
> > Fred K6DGW
> > Sparks NV USA
> > Washoe County DM09dn
> > <snip>
>
>
>
>
>
>--
>View this message in context:
>http://elecraft.365791.n2.nabble.com/Sync-AM-and-checking-VFO-accuracy-using-WWV-tp7624711p7624780.html
>Sent from the Elecraft mailing list archive at Nabble.com.
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[Wes Stewart-2]

I totally disagree.  If the manufacturer specifies that the transmitter puts out
100W, and indeed uses that as a part of the part number on the order sheet, then
it's not unreasonable for the customer to expect 100 W out.

That's like buying a Lamborghini Huracan LP 610-4 and discovering that it's not
610 HP and four-wheel drive but two-wheel drive and 300 HP and being told, why
complain, it's still faster than a Prius.

On 12/18/2016 11:09 AM, Emory Schley wrote:
> Hi Guys;..
>  
> One fellow seemed unhappy with a rig putting out "only" 80 watts instead of the full 100, but there is no way the ham on the other end of the QSO is going to detect the "deficit". It pretty much boils down to "Can he hear me" and "Can I hear him"? If the answer is yes to both questions, then all the rest is just fodder for textbooks and endless discussion/arguing.

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[Jim Brown-10]

On Sun,12/18/2016 2:04 PM, Wes Stewart wrote:
> If the manufacturer specifies that the transmitter puts out 100W, and
> indeed uses that as a part of the part number on the order sheet, then
> it's not unreasonable for the customer to expect 100 W out.

The published spec is 100W typical, with no tolerance specified.

73, Jim K9YC

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[Wes Stewart-2]

By your "logic" a few weeks ago when my 100 W K3S started putting out zero watts
it was still in spec, since there isn't any,  Right?

And if you want to open another can of worms let's talk about "typical" TX IMD.

On 12/18/2016 10:22 PM, Jim Brown wrote:
> On Sun,12/18/2016 2:04 PM, Wes Stewart wrote:
>> If the manufacturer specifies that the transmitter puts out 100W, and indeed
>> uses that as a part of the part number on the order sheet, then it's not
>> unreasonable for the customer to expect 100 W out.
>
> The published spec is 100W typical, with no tolerance specified.
>
> 73, Jim K9YC

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[Elecraft mailing list]

It is human nature to be disappointed if we don't get the nominal figure, but only the lower limit  even if still within spec.  We wouldn't complain if we got a few Watts more than the 100 Watts, and of course 100 Watts sounds like a lot more than 89 Watts just as $100 does to $89.

73 from David GM4JJJ

> On 19 Dec 2016, at 08:12, Walter Underwood <[hidden email]> wrote:
>
> For the KXPA100, the tolerance is specified. See page 30 of the manual.
>
> "Power Output: Max.100 watts at 13.8 V, 1.8 to 29.7 MHz and 80 watts 50-54 MHz PEP CW/SSB/DATA, ± 1 dB“
>
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
>> On Dec 18, 2016, at 9:22 PM, Jim Brown <[hidden email]> wrote:
>>
>> On Sun,12/18/2016 2:04 PM, Wes Stewart wrote:
>>> If the manufacturer specifies that the transmitter puts out 100W, and indeed uses that as a part of the part number on the order sheet, then it's not unreasonable for the customer to expect 100 W out.
>>
>> The published spec is 100W typical, with no tolerance specified.
>>
>> 73, Jim K9YC
>>
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