Re: [Elecraft] 10 MHz external reference - GPSDO

The XY RTTY tuning ovals are based on the mark and space signals which are 170 Hz apart. I can easily tune RTTY signals with the 10 Hz tuning step in the K3, so 10 Hz stability on both the transmitter and the receiver should be good enough for reliable operation. With the low stability TCXO

Re: [Elecraft] 10 MHz external reference - GPSDO

Eric, Thanks for the correction/update. That fits my measurements, exactly. I recall about the time the EXREF came out the better spec was given on the TCXO03-1. Regarding the use of wrong part terminology (TCXO-3) its just sloppy memory of the exact product number. I think most knew

Re: [Elecraft] 10 MHz external reference - GPSDO

Hi Ed, Minor note on our TCXO part numbers: The tighter temp stability TCXO (0.5 ppm typical) is actually Elecraft part number "TCXO3-1". This is the p/n that shows on the K3S order page and in the K3S kit manual as an upgrade. The standard TCXO (5 ppm) supplied with the K3S and K3 has the

Re: [Elecraft] 10 MHz external reference - GPSDO

The external reference is only applicable to the K3/K3S with the EXREF option. 73, Don W3FPR On 3/14/2016 3:51 AM, Cortland Richmond wrote: 50% OT but... I'm not complaining about stability, mind; the KX3 temperature compensation routine works really well, but if I use a GPSDO-clocked

Re: [Elecraft] 10 MHz external reference - GPSDO

On 3/13/2016 9:08 AM, Don Wilhelm wrote: I think everyone is ignoring something here. What causes the frequency drift in the first place? It is temperature changes - the designation TCXO signifies 50% OT but... I'm not complaining about stability, mind; the KX3 temperature compensation

Re: [Elecraft] 10 MHz external reference - GPSDO

Something I have wondered since running MMTTY and looking at the XY scope is, why do I see the XY ovals shifting clockwise as the station is transmitting. I find decoding is best when the ovals are as close to straight vertical & horizontal. If I let them rotate, I lose the cypher so I have to

Re: [Elecraft] 10 MHz external reference - GPSDO

se <dro...@necg.de>, elecraft@mailman.qth.net Subject: Re: [Elecraft] 10 MHz external reference - GPSDO Message-ID: <56e5663a.5080...@embarqmail.com> Content-Type: text/plain; charset=windows-1252; format=flowed I think everyone is ignoring something here. What causes the frequency dr

Re: [Elecraft] 10 MHz external reference - GPSDO

I think everyone is ignoring something here. What causes the frequency drift in the first place? It is temperature changes - the designation TCXO signifies Temperature Compensated Xtal Oscillator. It is already compensated for temperature. If the temperature of the TCXO stays the same, the

Re: [Elecraft] 10 MHz external reference - GPSDO

Frequency corrections can only be made in 1Hz steps (at 49.380MHz) and because the higher-specification TCXO should drift more slowly, fewer corrections should be required. But this would only be relevant if someone is using an ultra-narrowband digital mode that is sensitive to sudden small

Re: [Elecraft] 10 MHz external reference - GPSDO

Hi Oli, I agree it looks like there is no point in paying for the TCXO-3 if you have a reliable constantly available 10 MHz external reference. Perhaps they recommend the better TCXO as a better fallback if for any reason the external ref is not available, I can't think of any other reason for

Re: [Elecraft] 10 MHz external reference - GPSDO

what you have installed. Does that clear it up? 73, Ed - KL7UW The question to ask is what amount of frequency stability and accuracy is important for your type of operations. Date: Sat, 12 Mar 2016 08:17:32 +0100 From: Oliver Dr?se <dro...@necg.de> To: elecraft@mailman.qth.net Subject:

Re: [Elecraft] 10 MHz external reference - GPSDO

ortant for your type of operations. Date: Sat, 12 Mar 2016 08:17:32 +0100 From: Oliver Dr?se <dro...@necg.de> To: elecraft@mailman.qth.net Subject: Re: [Elecraft] 10 MHz external reference - GPSDO Message-ID: <56e3c28c.90...@necg.de> Content-Type: text/plain; charset=windows-1252; format=f

Re: [Elecraft] 10 MHz external reference - GPSDO

Oliver, I was wondering about this, I guess it is just that the short term drift is lower so it won't drift as much between frequency measurement corrections which are made for 1 second every 4 seconds according to some info recently published. I doubt it matters much though. I would be tempted

Re: [Elecraft] 10 MHz external reference - GPSDO

Why would I need the TCXO-3 instead of the TCXO-1 when using the K3EXREF if the accuracy and stability is provided by the EXREF? Am I overlooking something here? Tnx & 73, Olli - DH8BQA Contest, DX & radio projects: http://www.dh8bqa.de Am 11.03.2016 um 22:30 schrieb Edward R Cole: First

Re: [Elecraft] 10 MHz external reference - GPSDO

battery which is float-charged from a good 12v PS. 73, Ed - KL7UW Date: Fri, 11 Mar 2016 13:25:54 -0500 From: "Joe Subich, W4TV" <li...@subich.com> To: elecraft@mailman.qth.net Subject: Re: [Elecraft] 10 MHz external reference - GPSDO Message-ID: <56e30db2.6080...@subich.com

Re: [Elecraft] 10 MHz external reference - GPSDO

Note that 2 Hz refers only to the reference oscillator which is close to 49,380 kHz. That is about .04 ppm, or about 10 times greater than the specification for the high stability (optional) TCXO. The frequency accuracy at HF will also be .04 ppm - at 10 MHz that is 0.4 Hz, at 20 MHzit is

Re: [Elecraft] 10 MHz external reference - GPSDO

I am not arguing about that calculation Joe, it's proof that you don't need GPSDO accuracy as if will be several orders of magnitude better than that. 73 from David GM4JJJ > On 11 Mar 2016, at 18:25, Joe Subich, W4TV wrote: > > > > While locked to the external source, the

Re: [Elecraft] 10 MHz external reference - GPSDO

AM > To: Richard W. Solomon > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] 10 MHz external reference - GPSDO > > Dick, > > I found the reference to that figure I quoted, it is in the K3EXREF manual: > > The K3EXREF option locks the K3's reference oscillat

Re: [Elecraft] 10 MHz external reference - GPSDO

Thank you David. That article is very good and answered a lot of questions for me. 73 John AF6QO On 3/11/2016 8:03 AM, David Anderson wrote: You may want to have a look at this for some background on real world frequency stability, and remember that the K3 isn't phase locked to the external

Re: [Elecraft] 10 MHz external reference - GPSDO

> While locked to the external source, the K3’s reference > oscillator frequency is maintained within 2 Hz. The K3's reference oscillator is 49.380 MHz (+/-) not 10 MHz. The K3EXTREF uses the external 10 MHz signal to gate a counter which counts the reference. That count is then used to

Re: [Elecraft] 10 MHz external reference - GPSDO

Dick, I found the reference to that figure I quoted, it is in the K3EXREF manual: The K3EXREF option locks the K3's reference oscillator frequency to an external 10 MHz source by automatically controlling the REF CAL function. While locked to the external source, the K3’s reference oscillator

Re: [Elecraft] 10 MHz external reference - GPSDO

? > > 73, Dick, W1KSZ > > -Original Message- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David > Anderson > Sent: Friday, March 11, 2016 9:04 AM > To: g...@ka1j.com > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] 10 M

Re: [Elecraft] 10 MHz external reference - GPSDO

Hi, in case of such amount of bucks is planned to be spent for "ready to go" unit then Leo Bodnar is the very good choice but I preffer this "Low Jitter / Low Phase Noise" model:

Re: [Elecraft] 10 MHz external reference - GPSDO

read ? 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Anderson Sent: Friday, March 11, 2016 9:04 AM To: g...@ka1j.com Cc: Elecraft@mailman.qth.net Subject: Re: [Elecraft] 10 MHz external reference - GPSDO You may want to h

Re: [Elecraft] 10 MHz external reference - GPSDO

You may want to have a look at this for some background on real world frequency stability, and remember that the K3 isn't phase locked to the external reference and is only going to be within 2Hz. https://www.febo.com/pages/stability/ 73 from David GM4JJJ >

Re: [Elecraft] 10 MHz external reference - GPSDO

Hi Gary, Because the K3 only -frequency- locks the frequency to within about 2Hz you won't notice any difference between them. Similarly because the K3 TCXO isn't -phase- locked to the external reference any phase noise on the reference won't affect low phase noise of the synthesiser in the

Re: [Elecraft] 10 MHz external reference - GPSDO

I appreciate the replies to my question about sourcing a 10 MHz external reference for my K3s. I didn't realize I needed more than the K3EXREF to gain this accuracy and thanks to these replies, I now better understand what will and what will not work. While I would prefer to be able to buy a