I can answer 2, Julian. It is yes. If there is no external 10 MHz signal,
the K3 reference oscillator reverts to its normal operation. An asterisk
(splat, whatever one wants to call it) appears on the LCD when there's an
external signal detected, so you know at a glance whether the K3 is being
cont
The K3 connector is an SMA. Almost all of the Trimble units came with
a splitter, because E911 required two 10 MHz references to function.
Unless you need two sources yourself, I'd go direct from the Tbolt to
the K3 without the splitter, but it really doesn't matter. You'll
have plenty of 10 MHz
Now I'm just waiting for Elecraft to get the K3EXREF board in production to the
point they are available. I have obtained a Trimble Thunderbolt, a Larsen
marine GPS (read white mushroom) antenna and have ordered a 3 voltage power
supply for the Trimble. Right now I have it running on a pair o
On Sat, 16 Apr 2011 07:07:25 -0700 (PDT), you wrote:
The K3EXREF will use either a sine wave input at 4 to 16 dBm (2 to
3.3V), or a TTL signal. The manual advises using a 50 ohm series
resistor for 5V TTL to drop the voltage level into the proper range.
>1. Will the K3EXREF work straight from the
> 1. Will the K3EXREF work straight from the output of an Efratom LPRO-101
> or
> does it need a TTL square wave output or something else requiring extra
> circuitry between the LPRO and the K3?
A 10 MHz sine wave output from the Efratom is fine (+4 dBm to +16 dBm).
> 2. If the K3EXREF is instal
1. Will the K3EXREF work straight from the output of an Efratom LPRO-101 or
does it need a TTL square wave output or something else requiring extra
circuitry between the LPRO and the K3?
2. If the K3EXREF is installed, will the K3 still work as normal if the
frequency standard is not turned on? To
Correction - We have not released the EXREF. It is still going through
manufacture.
What I was referring to was the K144Xv Reference Lock board that locks
the LOs inthe K144XV to the K3s high accuract TCXO. That is now onthe
order form and in stock.
(Just typing too fast today... ;-)
Eric
On
It is now on the order page, with a link to the manual too. See:
http://www.elecraft.com/elecraft_prod_list.htm#144rflk
We have these now in stock.
73, Eric WA6HHQ
www.elecraft.com
On 4/13/2011 11:12 AM, Richard Thorpe wrote:
> When the K3EXREF becomes available where might we find it on th
When the K3EXREF becomes available where might we find it on the Elecraft web
site?
K6CG
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At first glance, frequency corrections being suspended during transmission
may have a large effect on the usefulness of the upcoming PLL board for the
K144XV. If the frequency is not compensated during TX, when maximum heating
(and therefore freq shift) takes place, it would seem that the K144XV co
Dave,
It hadn't occurred to me that frequency correction would be suspended
in Tx. That is both good and bad, as I see it. Good that no phase
jumps occur, but bad that transmitter drift is not being corrected.
For eme digital modes this means the freq. is solely held by the TCXO
over the min
No -- Installing a K3EXREF has no impact on VFO use (at any tuning
rate).
If you adjust REF CAL manually (i.e., with no K3EXREF unit installed),
you can move the reference in 1-Hz steps, but as Leigh pointed out,
the steps may not be exactly 1 Hz. This is due to DDS granularity.
Wayne
N6KR
Leigh,
I'm confused (as usual).
Are you saying that with the K3EXREF I will not be able to make a 1Hz change in
RX/TX frequency with the VFOs? That doesn't sound so good to me...
Please explain.
Thanks,
Tom
N5GE
On Wed, 6 Apr 2011 10:28:43 -0700 (PDT), "Leigh L. Klotz Jr WA5ZNU"
wrote:
>
Edward R. Cole wrote:
>
> The REF CAL adjustment is in 1-Hz steps same as the fine tuning resolution
> of the VFO.
>
My experience with REF CAL shows that turning the knob 1 unit does not
result in a 1Hz shift in the RX frequency.
Leigh/WA5ZNU
--
View this message in context:
http://elecr
out there can correct my interpretation where it is in error. I
73, Ed - KL7UW
--
Message: 28
Date: Tue, 5 Apr 2011 14:53:00 -0700 (PDT)
From: "Julian, G4ILO"
Subject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
To: elecraft@mailman.qth.net
Don.
WSPR is AFSK with a very small shift at a very low rate. My thinking is that
if a stepwise frequency correction was made during a transmit or receive
period, it would cause a corresponding shift of the VFO which might be
enough to throw the decoder of the receiver. I don't know, that's why I
Julian,
Please explain why you think any vfo tuning "steps" are related to a
frequency shift induced from the audio input to the K3. I believe this
is mixing two entirely separate parameters.
I have not actually operated WSPR, but it cannot be that difficult (nor
that precise in practice).
Thanks to Leigh for his detailed explanation. Also to you, Rich, for
explaining how the frequency standard is applied to the K3.
I still have a couple of questions.
If, as I believe is the case, the K3 REF CAL has fairly large discrete
steps, is there any benefit in using a reference oscillator t
> From: "Paul Christensen"
> To:
> Sent: Tuesday, April 05, 2011 3:36 PM
> Subject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
>
>
>>> 1. Any reference oscillator operating at 10 MHz would work with the
>>> K3XREF?
>>
>> The 10 MHz sou
a ext. ref. like a OCXO.
(sorry, probably way more than you wished to know)
73, Ed - KL7UW
--
Message: 20
Date: Tue, 5 Apr 2011 08:09:26 -0700 (PDT)
From: "Julian, G4ILO"
Subject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
To: elecraft@mailman.qth.net
Messa
for other
purposes. I use a second output from the Trimble to phase-lock an ADAT
transceiver.
Paul, W9AC
- Original Message -
From: "Paul Christensen"
To:
Sent: Tuesday, April 05, 2011 3:36 PM
Subject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
>> 1. Any reference
> 1. Any reference oscillator operating at 10 MHz would work with the
> K3XREF?
The 10 MHz source should have a signal level between +4 dBm and +16 dBm. For
square wave sources, 2VDC to 3.3VDC peak is optimum. If the source is a 5V
logic level, use a 50-ohm resistor in series with the input.
Hello James,
You are correct on #1 and #2, as long as the signal amplitude feeding the
K3EXREF is in
the range of +4 dBm to +16 dBm. The Thunderbolt 10 MHz output is typically
+12dBm (about
2.5V p-p), for example.
73,
Rich AC7MA
On 4/5/2011 12:11 PM, James Sarte (K2QI) wrote:
> Hello group
James,
For most HF operating, a calibrated K3 is about as "right on" as many
commercial broadcast stations (even with the normal TCXO), so I don't
think it is a great advantage (unless you are a real purist for
frequency accuracy).
That is for normal HF operating, but the picture changes when
Hello group,
It's been many months since I've posted here, much less actually done
something new with my K3. This topic has however piqued my interest.
Just so I understand fully, am I right in assuming then that the
following is correct:
1. Any reference oscillator operating at 10 MHz would wo
The K3EXREF uses the 10 MHz standard as it's time base to measure the K3's TCXO
and passes
an error value to the K3's MCU every few seconds. No TCXO frequency control
takes place,
thus no increase in phase noise. Frequency compensation is done in software by
automatically updating the REF CA
Igor, N1YX
- Original Message -
From: "G4ILO Julian"
To: elecraft@mailman.qth.net
Sent: Tuesday, April 5, 2011 11:09:26 AM
Subject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
What are the advantages / disadvantages of this type of frequency standard
over the Efratom
Julian, G4ILO wrote:
>
> What are the advantages / disadvantages of this type of frequency standard
> over the Efratom LPRO-101 which is a rubidium standard?
>
> Julian, G4ILO
>
I'm a duffer at this time/frequency stuff, but I've scored well enough at
the ARRL FMT to get my call in QST, and I
On 4/5/2011 10:06 AM, Leigh L. Klotz Jr WA5ZNU wrote:
>
> I've got a more basic question than that. What are external, GPS synched
> freq standards used for?
GPS relies on very accurate timing of it's signals. Each satellite
carries an atomic clock [Rubidium?] and the frequency of the satellite
t; -Original Message-
> From: Julian, G4ILO <julian.g4...@gmail.com>
> To: elecraft <elecraft@mailman.qth.net>
> Sent: Tue, Apr 5, 2011 11:09 am
> Subject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
>
>
> What are the advantages / disadva
ubject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
What are the advantages / disadvantages of this type of frequency standard
ver the Efratom LPRO-101 which is a rubidium standard?
Julian, G4ILO
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I should have added that USD $70 was the offered and accepted price.
Shipping was very fast as well.
> - Original Message -
> From: "Matt Zilmer"
> To: "Paul Christensen"
> Cc:
> Sent: Tuesday, April 05, 2011 11:40 AM
> Subject: Re: [Elec
Several folks have inquired about the Thunderbolt's $70 price. The big
on-line auction place. Seller name: "svcompucycle"
Paul, W9AC
- Original Message -
From: "Matt Zilmer"
To: "Paul Christensen"
Cc:
Sent: Tuesday, April 05, 2011 11:40 AM
I would say the main disadvantage is that you need a suitably positioned
GPS antenna. I understand that the GPS satellites use Caesium resonators
so in theory could be more accurate than Rubidium.
Another alternative is an off-air frequency standard controlled by the
Radio 4 transmission on 198kHz
Thanks Paul. Good summary and reference info.
The K3EXREF certainly works as advertised. I've already used two
different Rb sources, and it's solid as a rock. Using a TIA over the
weekend,, saw a 1 to 2 Hz wander at 28MHz, however the Rb clocks have
a little start-up drift and the wander might
What are the advantages / disadvantages of this type of frequency standard
over the Efratom LPRO-101 which is a rubidium standard?
Julian, G4ILO
-
Julian, G4ILO. K2 #392 K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/k
.
Paul, W9AC
- Original Message -
From: "Joe Subich, W4TV"
To: "Paul Christensen"
Cc:
Sent: Tuesday, April 05, 2011 10:05 AM
Subject: Re: [Elecraft] K3EXREF and Trimble Thunderbolts
>
> Paul,
>
>> 3) Power supplies: I like OEM/off-board s
Paul,
> 3) Power supplies: I like OEM/off-board supplies by PowerOne, Condor,
> and International Power. They offer excellent performance and low
> noise. I am using an International Power IHBAA-40W. Also look for
> HBAA-40W.
What are the power requirements? Would it not be possible to build
a
Those of you considering a GPS-disciplined oscillator for use with the
K3EXREF may be interested in this: I recently purchased two Trimble
Thunderbolts on the surplus market to compare against my HP 58540A and
Brandywine GPS4 units. After several days of testing, I'm retiring the HP
and Brandy
In the next 3-5 weeks. We are putting this into production now.
73, Eric
On 4/1/2011 3:25 PM, Richard Thorpe wrote:
> So I have my GPS regulated TCXO 10mhz source. I've been teased by the beta
> tester reports. So when might we see the latest addition to the K3.
>
> K6CG
> ___
So I have my GPS regulated TCXO 10mhz source. I've been teased by the beta
tester reports. So when might we see the latest addition to the K3.
K6CG
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Phil,
You wait until it is released. It is being tested by a few right now.
No, I don't know when that will be.
73,
Don W3FPR
On 3/25/2011 8:30 PM, Phil Theis wrote:
>I see talk of this external reference device.
> How does one get this?
> Nothing results in a search on the Elecraft websi
I see talk of this external reference device.
How does one get this?
Nothing results in a search on the Elecraft website.
Been waiting for this since K3 came out.
Phil K3(352)TUF
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Right. The WSPR receive window is a couple of hundred hz wide. Your freq
doesn't have to be accurate, but your clock should be within a second of the
right time.
BTW, you can use WSPR to calibrate your rx and measure freq within a hz or
so; Dr. Taylor's instructions are in the latest documentation
> If you want to participate in the WSPR project you need to be within 1Hz.
> 73
> Max/ZL4VV
Actually, No. You just want to -drift- less than one Hertz during your
transmission period. Absolute accuracy is not required. A stable transmitter
is.
73,
Bruce, N1RX
__
If you want to participate in the WSPR project you need to be within 1Hz.
73
Max/ZL4VV
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