HI
If you decide to build your ham receiver from scratch, you then head out to
buy a surplus signal generator for < $100 or so. You buy a couple other pieces
of gear, but none of them are as expensive. Back in the day, your TR4 cost way
more than the “bench gear” to do this or that.
By far, the
I have used the switched capacitor type, with direct control over the
switching caps .
We were able to high speed dither the switch settings to get 1/2 and 1/4
and 1/8 steps of the minimum capacitor switch step. This way, we got
high control resolution.
BUT- this only works for requirements
Hi Erik,
I only saw that thread later, and I will have to return to that as I
have a little more energy.
I'm trying to get you up to speed with the many variants there is, and
there is plenty experience here to feed from. What may be true for one
device will not make any sense for another.
Dear Joe,
On 2022-02-13 23:31, Joseph Gwinn wrote:
On Sun, 13 Feb 2022 03:30:30 -0500, time-nuts-requ...@lists.febo.com
wrote:
time-nuts Digest, Vol 214, Issue 15
Attila,
Date: Sat, 12 Feb 2022 20:38:48 +0100
From: Attila Kinali
Subject: [time-nuts] Types of noise (was: Phase Station 53100A
https://www.nist.gov/news-events/news/2022/02/jila-atomic-clocks-measure-einsteins-general-relativity-millimeter-scale
Something for people here in this group to strive for???
Jeff Z.
Sent from my iPad
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On Fri, 18 Feb 2022 11:56:02 +0100
Magnus Danielson via time-nuts wrote:
> I think you have yourself a digital TCXO controller. Those use a
> tempsensor, use the reading to calculate the compensation and the use a
> normal varactor control to steer the frequency.
Quick side note: On modern,
On Tue, 15 Feb 2022 17:07:54 -0500
Joseph Gwinn wrote:
> > That's an interesting noise model. And one that is oddly specific.
> > Did you see that in some application? If yes, could you explain a bit more?
>
> When integrating large systems, people have a lot of trouble with
> loose and/or
On Fri, 18 Feb 2022 12:19:23 -0800
Larry Gadallah wrote:
> The local elders croaked out: "You don't want to do that. You won't
> learn anything. You should build your own radio from scratch and gain
> some valuable experience." So, here I am some 40 years later, getting
> the exact opposite
Hi Bob:
I had to LoL (laugh out loud) when I read your message. I definitely
get what you are saying, but it amused me to no end; When I got my
first ham license, one of my elmers was the regional distributor for
Drake, so I announced my intention to take my hard earned cash and
purchase a shiny
Hi
If it’s a sub $1 device, it’s pretty much guaranteed that it has digital
“stuff” inside it. That circuitry will generate blips and pops totally
independent of any attempt it makes at compensation. If it “wakes
up” this or that digital sub section every 107.34 seconds, you get
an internal
Hi Magnus,
Tom also replied to my question and suggested a 107.34 seconds interval
related to dithering with a 1e7/2^30 interval
Unfortunately the datasheet is rather short (sub $1 device) and does not
provide any hints to being a digital implementation.
Thanks to all for helping!
Erik.
Bill,
To test I removed the thermal insulation to increase the heat loss
requiring more heat to be generated.
The jump pattern did not change!
Erik.
On 18-2-2022 11:26, bill wrote:
Hello,
My guess is that it is a quirk of the temperature compensation network
inside the TCXO. I have seen
Hi Erik,
I think you have yourself a digital TCXO controller. Those use a
tempsensor, use the reading to calculate the compensation and the use a
normal varactor control to steer the frequency. Older TCXOs use a
resistor/thermistor network to do the same work. You can probably read
up on the
Mike, the counter resolution was 40ps with am RMS resolution of 120ps
Erik.
On 18-2-2022 11:36, Mike Ingle wrote:
Hi Erik.
What is your counter resolution/gate time? At 1second, the interval
difference from 10MHz + 5mHz is 500ps. --mike
On Fri, Feb 18, 2022 at 11:20 AM Erik Kaashoek wrote:
Hi Erik.
What is your counter resolution/gate time? At 1second, the interval
difference from 10MHz + 5mHz is 500ps. --mike
On Fri, Feb 18, 2022 at 11:20 AM Erik Kaashoek wrote:
> During long term testing of some 10 MHz TCXO the output frequency seems
> to jump within one second 20 mHz (
Hello,
My guess is that it is a quirk of the temperature compensation network
inside the TCXO. I have seen similar behavior in commercial TCXOs as
temperature changes as a result of "break points" in the compensation
network. It is difficult to know exactly unless it is possible to
During long term testing of some 10 MHz TCXO the output frequency seems
to jump within one second 20 mHz ( millihertz) up in frequency every
110 seconds up and after a 25 seconds, again within one second, the same
amount down. The noise in the frequency measurement was well below 5 mHz
In an
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