hi! guess you will find the magazine here: rahul vu3wjm --- On Fri, 29/4/11, Nitin Muttin <vu3tyg@yahoo.co.in> wrote:
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Friday, April 29, 2011
Re: [HamBrewers] Elektor weekly
Re: [HamBrewers] Elektor weekly
Saw them in a KL registered auto near the kaveri theater at Bangalore for days back.
73's
Nitin [VU3TYG]
From: Raj <vu2zap@gmail.com>
To: hambrewers@yahoogroups.com
Sent: Fri, 29 April, 2011 1:17:16 PM
Subject: [HamBrewers] Elektor weekly
Some interesting articles:
Turn your Ipad/iPhone into a scope
Racing through India in a Autorickshaw!
http://www.elektor.com/news.45.lynkx
CHeers
--
Raj, vu2zap
Bengaluru, South India.
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[HamBrewers] Elektor weekly
Some interesting articles:
Turn your Ipad/iPhone into a scope
Racing through India in a Autorickshaw!
http://www.elektor.com/news.45.lynkx
CHeers
--
Raj, vu2zap
Bengaluru, South India.
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Monday, April 25, 2011
Re: [HamBrewers] Mini Cesium clock module
Hi Raj, Prasad, all,
Really sorry, I though yesterday I should have gone directly to bed instead of reading my e-mails.
I read the article too fast...
Yes this new design is really interesting and all in all a 1500 USD price point is not so high for professional applications.
Some laboratories were using VLF or HF radio-clock signals but they are shut down or at least of reduced budget in many countries.
Rubidium clocks are not so expensive but need a GPS source for calibration, and in the concrete building of many laboratories it is not so convenient...
73,
Yan.
---
Yannick DEVOS - XV4Y/XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)
Le 25 avr. 2011 à 21:50, Raj a écrit :
>
>
> Hi Yan,
>
> These references don't need any input. They use the modulation of a cesium beam to generate a clock frequency. These chaps have made the Cesium lamp in 2mm cubic volume.. amazing!
>
> Currently the affordable one is an used Rubedium reference which is about 120U$ range. This has good short term stability. One needs to calibrate it with a GPS based oscillator. I use a Thunderbolt unit with an external antenna and compare it with an old Rb unit and adjust it over a 10-20 minute period and that is good enough for me. I use the Rb output 10Mhz into my counters as external reference and take great pleasure in saying the accuracy is about 1 Hz in 1 GHz.. highly addictive hobby!
>
> 73 Raj vu2zap
>
>
>> As I understand this board needs to receive a radio signal in order to get the time.
>> Do you receive reliably this signal in India? What is its frequency?
>>
>> Back in Europe few years ago I was used to have clocks synchronized with DCF77 signal on 77 KHz.
>> They are of no usage here for clock reference...
>>
>> 73,
>> Yan.
>> ---
>> Yannick DEVOS - XV4Y/XV4TUJ
>> http://capheda.wordpress.com/ (Blog in french)
>> http://www.qsl.net/xv4tuj/ (web page in english)
>>
>> Le 25 avr. 2011 à 15:01, Raj a écrit :
>>
>> >
>> >
>> > This should keep our homebrewers from drifting!
>> >
>> > From the time-nuts group:
>> >
>> > http://tinyurl.com/CesiumMini
>> >
>> > or click here
>> >
>> > 73
>> > --
>> > Raj, vu2zap
>> > Bengaluru, South India.
>> >
>> >
>
>
>
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Re: [HamBrewers] Mini Cesium clock module
Prasad, I wish I had one!
In the meanwhile I was drooling on this project..
http://www.amug.org/~jthomas/watch.html
Cheers
Raj
Yannick,
I am not sure if Raj has got one of these, he might have. the article mentions the cost as $1,500 :)
73 de Prasad VU2PTT
On Mon, Apr 25, 2011 at 7:20 PM, Yannick (XV4Y) <yannick.devos@online.fr > wrote:
- Hi Raj,
- As I understand this board needs to receive a radio signal in order to get the time.
- Do you receive reliably this signal in India? What is its frequency?
- Back in Europe few years ago I was used to have clocks synchronized with DCF77 signal on 77 KHz.
- They are of no usage here for clock reference...
- 73,
- Yan.
- ---
- Yannick DEVOS - XV4Y/XV4TUJ
- http://capheda.wordpress.com/ (Blog in french)
- http://www.qsl.net/xv4tuj/ (web page in english)
- Le 25 avr. 2011 à 15:01, Raj a écrit :
- >
- >
- > This should keep our homebrewers from drifting!
- >
- > From the time-nuts group:
- >
- > http://tinyurl.com/CesiumMini
- >
- > or click here
- >
- > 73
- > --
- > Raj, vu2zap
- > Bengaluru, South India.
- >
- >
- >
- >
- >
Raj, VU2ZAP
Bangalore, India.
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MARKETPLACE
.
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Re: [HamBrewers] Mini Cesium clock module
Hi Yan,
These references don't need any input. They use the modulation of a cesium beam to generate a clock frequency. These chaps have made the Cesium lamp in 2mm cubic volume.. amazing!
Currently the affordable one is an used Rubedium reference which is about 120U$ range. This has good short term stability. One needs to calibrate it with a GPS based oscillator. I use a Thunderbolt unit with an external antenna and compare it with an old Rb unit and adjust it over a 10-20 minute period and that is good enough for me. I use the Rb output 10Mhz into my counters as external reference and take great pleasure in saying the accuracy is about 1 Hz in 1 GHz.. highly addictive hobby!
73 Raj vu2zap
As I understand this board needs to receive a radio signal in order to get the time.
Do you receive reliably this signal in India? What is its frequency?
Back in Europe few years ago I was used to have clocks synchronized with DCF77 signal on 77 KHz.
They are of no usage here for clock reference...
73,
Yan.
---
Yannick DEVOS - XV4Y/XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)
Le 25 avr. 2011 à 15:01, Raj a écrit :
>
>
> This should keep our homebrewers from drifting!
>
> From the time-nuts group:
>
> http://tinyurl.com/CesiumMini
>
> or click here
>
> 73
> --
> Raj, vu2zap
> Bengaluru, South India.
>
>
__._,_.___
MARKETPLACE
.
__,_._,___
Re: [HamBrewers] Mini Cesium clock module
I am not sure if Raj has got one of these, he might have. the article mentions the cost as $1,500 :)
73 de Prasad VU2PTT
On Mon, Apr 25, 2011 at 7:20 PM, Yannick (XV4Y) <yannick.devos@online.fr> wrote:
Hi Raj,
As I understand this board needs to receive a radio signal in order to get the time.
Do you receive reliably this signal in India? What is its frequency?
Back in Europe few years ago I was used to have clocks synchronized with DCF77 signal on 77 KHz.
They are of no usage here for clock reference...
73,
Yan.
---
Yannick DEVOS - XV4Y/XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)
Le 25 avr. 2011 à 15:01, Raj a écrit :
>
>
> This should keep our homebrewers from drifting!
>
> From the time-nuts group:
>
> http://tinyurl.com/CesiumMini
>
> or click here
>
> 73
> --
> Raj, vu2zap
> Bengaluru, South India.
>
>
>
>
>
__._,_.___
.
__,_._,___
Re: [HamBrewers] Mini Cesium clock module
Hi Raj,
As I understand this board needs to receive a radio signal in order to get the time.
Do you receive reliably this signal in India? What is its frequency?
Back in Europe few years ago I was used to have clocks synchronized with DCF77 signal on 77 KHz.
They are of no usage here for clock reference...
73,
Yan.
---
Yannick DEVOS - XV4Y/XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)
Le 25 avr. 2011 à 15:01, Raj a écrit :
>
>
> This should keep our homebrewers from drifting!
>
> From the time-nuts group:
>
> http://tinyurl.com/CesiumMini
>
> or click here
>
> 73
> --
> Raj, vu2zap
> Bengaluru, South India.
>
>
>
>
>
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.
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Re: [HamBrewers] Mini Cesium clock module
Try after some time, servers are down I think!
At 25-04-2011, you wrote:
All I get at both links is this:
Message from the NSAPI plugin:
No backend server available for connection: timed out after 10 seconds or idempotent set to OFF.
73 ..
On Mon, Apr 25, 2011 at 1:31 PM, Raj <vu2zap@gmail.com> wrote:
- This should keep our homebrewers from drifting!
- From the time-nuts group:
- http://tinyurl.com/CesiumMini
- or click here
- 73
- --
- Raj, vu2zap
- Bengaluru, South India.
Raj, VU2ZAP
Bangalore, India.
__._,_.___
.
__,_._,___
Re: [HamBrewers] Mini Cesium clock module
Message from the NSAPI plugin:
No backend server available for connection: timed out after 10 seconds or idempotent set to OFF.
73 ..
On Mon, Apr 25, 2011 at 1:31 PM, Raj <vu2zap@gmail.com> wrote:
This should keep our homebrewers from drifting!
From the time-nuts group:
http://tinyurl.com/CesiumMini
or click here
73
--
Raj, vu2zap
Bengaluru, South India.
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.
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[HamBrewers] Mini Cesium clock module
This should keep our homebrewers from drifting!
From the time-nuts group:
http://tinyurl.com/CesiumMini
or click here
73
Raj, vu2zap
Bengaluru, South India.
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Saturday, April 23, 2011
[HamBrewers] Hambrewers
Folks,
Happy Easter. I hope your weekend is going great!
We have hundreds of you online with us from all over the world.
This place is to share interesting ham radio LINKS.. articles, circuits or schematics.. DIY projects, kits etc.
Share homebrew ideas for discussion.. however crazy it may sound!
Share homebrew nostalgia..
Anything with common interest goes here!
73 Raj vu2zap
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Monday, April 18, 2011
[HamBrewers] Sun finally waking up
Saturday, April 16, 2011
[HamBrewers] Yet another prediction ? - From Yahoo news
Sun's Storm Season Finally Heating Up
SPACE.com Staff,Space.com – Sat Apr 16, 6:15 pm ET
After three years in a deep solar sleep of historic proportions, the sun is finally starting to wake up.
Sunspots cooler regions fraught with intense magnetic fields now regularly dot the surface of the sun, and the star has unleashed several powerful flares in recent months, including a Feb. 14 blast that was the most powerful outburst in more than four years. All signs suggest that the sun has shaken itself out of its slumber, researchers say.
"Finally, we are beginning to see some action," said Richard Fisher, head of the Heliophysics Division at NASA headquarters in Washington, in a statement. [ Amazing Sun Photos from Space]
The (solar) wait is over
In 2008, the sun plunged into its least active state in nearly a century. Sunspots all but vanished, solar flares subsided and the star was eerily quiet.
Quiet spells on the sun are nothing new. They come along every 11 years or so, as part of the sun's natural activity cycle. But this latest solar minimum lasted longer than usual, prompting some researchers to wonder if it would ever end.
"It's been three long years," Fisher said.
That wait appears to be over.
This year has started off with a bang, as sunspots are crackling with activity. Earth-orbiting satellites have detected two so-called X-class solar flares the most powerful type with one erupting on Valentine's Day, while the other occurred on March 9, researchers said. [ Video: The Sun Woke Up on Valentine's Day]
Another event on March 7 hurled a billion-ton cloud of charged particles away from the sun at 5 million mph (8 million kph). This blast, known as a coronal mass ejection, wasn't aimed directly at Earth, but it did deliver a glancing blow to our planet's magnetic field.
The off-center impact on March 10 supercharged the aurora borealis also known as the northern lights creating magnificent displays as far south as Wisconsin, Minnesota and Michigan. [ The Spectacular Aurora of March 2011]
"That was the fastest coronal mass ejection in almost six years," said Angelos Vourlidas of the Naval Research Lab in Washington, D.C. "It reminds me of a similar series of events back in Nov. 1997 that kicked off Solar Cycle 23, the solar cycle before this one. To me, this marks the beginning of Solar Cycle 24."
A historically deep sleep
The slow build-up to this moment is more than just "the watched pot failing to boil," said Ron Turner, a space weather analyst at Analytic Services, Inc. "It really has been historically slow."
There have been 24 numbered solar cycles since researchers started keeping track of them in the mid-18th century. In an article to appear in the Space Weather Journal, Turner counted up sunspots and determined that only four solar cycles in recorded history have ever started more slowly than this one.
"Three of them were in the Dalton Minimum, a period of depressed solar activity in the early 19th century. The fourth was Cycle number 1 itself, around 1755, also a relatively low solar cycle," Turner said.
Experts predict solar activity will peak around 2013.
So Earth could soon be seeing yet more powerful solar storms, which could mean more stunning auroras as well as some less desirable side effects the blasts can disrupt satellites and power grids, as well as pose a danger to astronauts on spacecraft.
Follow SPACE.com for the latest in space science and exploration news on Twitter @Spacedotcom and on Facebook.
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Thursday, April 14, 2011
[HamBrewers]
News
Rockwell Collins sets new high mark for data transfer
April 13, 2011
Rockwell Collins announced the latest record-breaking results of over-the-air trials of Wideband High Frequency (WBHF) technology - a development bringing high-speed data transfer rates over HF channels to a new level.
During the Trident Warrior multi-national exercise in March 2011, Rockwell Collins engineers demonstrated, for the first time, a remarkable data transfer rate of 90 kilobits per second, in an 18 kHz HF bandwidth, over a 1,000-mile HF link between
"What our engineers have achieved is nothing less than extraordinary. They've applied their vast communications expertise to break the common perception that the HF band is not capable of supporting data at these transfer rates," said Bruce King, vice president and general manager of Communication Products for Rockwell Collins.
The advent of WBHF ushers in a new era for HF users, enabling them to utilize significant capabilities, previously unavailable via HF, such as streaming video and large file transfers, making HF a "viable augmentation to narrowband satellite communications," explained King.
Source: Rockwell Collins
Follow Shephard News on Twitter
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