Thursday, June 30, 2011

Re: [HamBrewers] What? You Only Have ONE Antenna?

 

Very good article!
 
73's
Siddhu

From: padmanabhan cattamanchi <PEPINDIA@yahoo.com>
To: vuhams@yahoogroups.com
Cc: hambrewers@yahoogroups.com
Sent: Thu, June 30, 2011 7:14:58 AM
Subject: [HamBrewers] What? You Only Have ONE Antenna?

 


An interesting article

http://www.eham.net/articles/26037


73,s
Paddy
vu2pep

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[HamBrewers] What? You Only Have ONE Antenna?

 
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Wednesday, June 29, 2011

[HamBrewers] Interesting - Dual Band CW - Kit

 
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Friday, June 24, 2011

[HamBrewers] CAT Interface / PSK31 Interface for Yaesu FT-890AT

 

Hello all,

I am looking for a USB CAT Interface and a PSK31 Interface for my
Yaesu FT-890AT.

Will any one have a spare one each to sell ? Many thanks.

73,

James VU2ARL.

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[HamBrewers] Interface

 

http://www.n4shd.net/WA4BDSDigitalDisk/Hardware/KH6TY-interface.pdf

73,
Santosh VU3GFF

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Thursday, June 23, 2011

[HamBrewers] Fwd: [SCCC] Bob Pease - Author and Great Contributor to EDN and other Magazines Silent Key

 

---------- Forwarded message ----------
From: "Dennis Vernacchia" <n6ki73@gmail.com>
Date: 23-Jun-2011 1:34 PM
Subject: [SCCC] Bob Pease - Author and Great Contributor to EDN and other Magazines Silent Key
To: "SCCC Reflector" <sccc@contesting.com>, <sddxcnews@yahoogroups.com>

Got this from most recent  ARRL Contest Update Newsletter

I am sure some of you working in Electronics employment may have enjoyed Bob
Pease Articles and insight and Humor over the years
in EDN ( Electronic Design News ) and other Electronic Industry Articles and
publications

Bob Pease ( and Jim Williams )  will be sadly missed

*Although neither of these gentlemen was highly-connected to the radiosport
world, both Jim
Williams<http://www.edn.com/article/518496-Analog_guru_Jim_Williams_dies_after_stroke.php>and
Bob
Pease<http://www.edn.com/article/518568-Analog_engineering_legend_Bob_Pease_killed_in_car_crash.php>
were intimately involved with the electronic technology that underlies much
of what we do, both on and off the air.
They were legends in the world of analog electronics design and both died
suddenly in the past week.
Hams will recognize a kindred soul in this NPR
story<http://www.npr.org/templates/story/story.php?storyId=4053122>about
Jim's travels through the surplus electronics catacombs
 of Silicon Valley and his appreciation for technology as shown by this
video beginning with him standing in front of his
 living-room art installation - a recreated Minuteman missile guidance
computer <http://www.youtube.com/watch?v=I6ODi7qSpYg>. Similarly, the
workbench
 of Bob Pease is legendary for its apparent
disorder<http://www.rfcafe.com/references/electrical/bob-pease-breadboard.htm>from
which sprouted well-crafted and engineered designs.
Both were also legendary for their abilities to write and present with
clarity and inspiration - references to
 Bob's "Pease Porridge<http://electronicdesign.com/article/analog-and-mixed-signal/Bob-Pease-Remembered-For-Pease-Porridge-And-A-Whole-Lot-More.aspx>"
*

*
http://electronicdesign.com/article/analog-and-mixed-signal/Bob-Pease-Remembered-For-Pease-Porridge-And-A-Whole-Lot-More.aspx
*

*and "What's All This..." columns have made an occasional appearance in this
newsletter
and both men have authored books considered classics in the field.
Personally, both were a huge inspiration
 to your editor as a writer and author of technical material - having
demonstrated how to do it right.
To say they will be missed is a gross understatement. (Thanks, Doug K1DG and
others for links)
*
_______________________________________________
SCCC mailing list
SCCC@contesting.com
http://lists.contesting.com/mailman/listinfo/sccc

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Monday, June 20, 2011

[HamBrewers] Source for schottky diodes in India

 
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Thursday, June 16, 2011

[HamBrewers] Woes!

 
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Tuesday, June 14, 2011

RE: [HamBrewers] PC SMPS

 



You can use the +12 line and -12 line and make a 24 V supply using a single SMPS. However, you should be careful about the current capacity of the -12 line - it is usually not more than few hundred MA.
 
AT type power supply is easy to modify - it has the 494 chip.
 
In any case, I strongly recommend NOT TO US PC SMPS for our radio. In spite of the large current rating, they are not built for sudden loads like when you press the PTT. In Chennai, we can buy a 20Amps fine SMPS for 1500 bucks.
 
73's and good luck.
Raj.
 
-----Original Message-----
From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com]On Behalf Of padmanabhan cattamanchi
Sent: Tuesday, June 07, 2011 11:40 AM
To: HamBrewers@yahoogroups.com
Subject: Re: [HamBrewers] PC SMPS

 

Sounds a bit complicated. Is it possible to make 24v supply using two of them in series, I was told it cannot be done because of the floating outputs.

73,s
Paddy
vu2pep

--- On Mon, 6/6/11, Hari <harigee@yahoo.com> wrote:

From: Hari <harigee@yahoo.com>
Subject: Re: [HamBrewers] PC SMPS
To: HamBrewers@yahoogroups.com
Date: Monday, June 6, 2011, 11:16 PM

 

Paddy,
 
  This works ,
I have used it as described and also made one of my own with the same configuration.the trick is to get the oldest one as possible so that they have the 494 chip.
I later brought few for 50Rs each and then pulled out the required components and then made one of my own.

73
Hari

--- On Thu, 6/2/11, padmanabhan cattamanchi <PEPINDIA@yahoo.com> wrote:

From: padmanabhan cattamanchi <PEPINDIA@yahoo.com>
Subject: Re: [HamBrewers] PC SMPS
To: HamBrewers@yahoogroups.com
Date: Thursday, June 2, 2011, 1:15 PM

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Monday, June 13, 2011

[HamBrewers] Ceramic magnets available?

 

Hi
 
Any source for ring type ceramic magnets in around Mumbai preferably? or maybe India :-)
 
Thank you for your time.
 
Thanks and regards
 
 
Ravi


--
Live with the 3E's -- Energy, Enthusiasm and Empathy

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Re: [HamBrewers] req schematic diagram

 

thanks for the info
let me try

bhadresh

vu3pji

From: Raj <vu2zap@gmail.com>
To: HamBrewers@yahoogroups.com
Sent: Sunday, 12 June 2011 5:56 PM
Subject: Re: [HamBrewers] req schematic diagram

 
Bhadresh,

Most programming cables are RS232 to TTL convertors. You get loads of info on the net. You can get a board & parts for 10$ on the eBay.

Here is something:
http://www.scienceprog.com/simple-ttl-to-rs232-adapter/

You will need to find out RX, TX and GND pins on the rig.

73 Raj

At 12-06-2011, you wrote:
 

i want schematic diagram of cable to program my kenwood radio TK480
if anybody have so, or let me know the web-address where it is available

lots of thanks in advance

bhadresh


vu3pji




























































--
Raj, VU2ZAP
Bangalore, India.


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Sunday, June 12, 2011

Re: [HamBrewers] req schematic diagram

 

Bhadresh,

Most programming cables are RS232 to TTL convertors. You get loads of info on the net. You can get a board & parts for 10$ on the eBay.

Here is something:
http://www.scienceprog.com/simple-ttl-to-rs232-adapter/

You will need to find out RX, TX and GND pins on the rig.

73 Raj

At 12-06-2011, you wrote:

 

i want schematic diagram of cable to program my kenwood radio TK480
if anybody have so, or let me know the web-address where it is available

lots of thanks in advance

bhadresh


vu3pji




























































--
Raj, VU2ZAP
Bangalore, India.

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[HamBrewers] req schematic diagram

 

i want schematic diagram of cable to program my kenwood radio TK480
if anybody have so, or let me know the web-address where it is available 

lots of thanks in advance

bhadresh


vu3pji




























































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Saturday, June 11, 2011

Re: [HamBrewers] Help: ATMEL Flash ROM needed

 

I've bought stuff from these chaps with no problems Pramod.

At 10-06-2011, you wrote:

 

http://www.futurlec.com/Memory/AT29C020.shtml

--- On Thu, 6/9/11, Pramod <vu2ttp@gmail.com> wrote:

From: Pramod <vu2ttp@gmail.com>
Subject: [HamBrewers] Help: ATMEL Flash ROM needed
To: "hambrewers" <hambrewers@yahoogroups.com>
Date: Thursday, June 9, 2011, 10:23 PM

 

--
Raj, VU2ZAP
Bangalore, India.

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Re: [HamBrewers] Help: ATMEL Flash ROM needed

 

Anytime.....

Ron
VU2ORO
Indirapuram


--- On Fri, 6/10/11, Pramod <vu2ttp@gmail.com> wrote:

From: Pramod <vu2ttp@gmail.com>
Subject: Re: [HamBrewers] Help: ATMEL Flash ROM needed
To: HamBrewers@yahoogroups.com
Date: Friday, June 10, 2011, 6:37 AM

 

Thanks a million Ranajay.


cheers
Pramod

On Fri, Jun 10, 2011 at 2:36 PM, ranajay mallik <rmallik74@yahoo.com> wrote:
 

http://www.futurlec.com/Memory/AT29C020.shtml

--- On Thu, 6/9/11, Pramod <vu2ttp@gmail.com> wrote:

From: Pramod <vu2ttp@gmail.com>
Subject: [HamBrewers] Help: ATMEL Flash ROM needed
To: "hambrewers" <hambrewers@yahoogroups.com>
Date: Thursday, June 9, 2011, 10:23 PM


 
Hi,

Looking for 3 or 4 of these devices, if any one has it pls let me know off-line. If  there is a pin compatible equivalent device, pls suggest.

This device is used in Trunked Radios and stores the operational parameters like the freq table, power levels programmed etc..

Technical/Catalog Information AT29C020-90TI
Vendor  Atmel
CategoryIntegrated Circuits (ICs)
Memory TypeFLASHMemory Size2M (256K x 8)
Speed90ns
Interface ParallelPackage / Case32-TSOPPackagingTray
NamesAT29C020 90TI   or AT29C02090TI

73s
vu2ttp


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