Monday, December 31, 2012

[HamBrewers] FW: vendor-Two way radio/Baojie Electronics Co.,Ltd

 

Happy New year to all of you

Radio Suppliers send me regular updates on various new products & brands.

As I am not into Radio Business for last 4 years  

I wish to  share this info with all of you and you can see the link below of some new brands of Radios   

wwwqzbaojiecom

 

best 73

Pop

VU2POP

 

From: sales1 [mailto:sales1@qzbaojie.com]
Sent: Sunday, December 30, 2012 1:14 PM
To: popcomex
Cc: nickchen19881219@yahoo.com; nick.qzbaojie@gmail.com
Subject: vendor-Two way radio/Baojie Electronics Co.,Ltd

 

Dear Prathap Kumar:

 

Thanks for your time to read my email.
Glad to know you are in the market of two way radio.
Please kindly visit : wwwqzbaojiecom for more product and information.
Wish our products will be helpful for your business.
Any question, welcome here.

Best regards

 


Nick Chen
 
Sales department
 
Tel:86-0595-86789002
 
Quanzhou Baojie Electronics Co., Ltd

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Sunday, December 23, 2012

[HamBrewers] QRSS, WSPR, DDS : Some software code I want to share with you

 

Hi HAMBrewers,

Here some pieces of code that I'd like to share with you :
- A keyer for synchrone QRSS (allowing stacking of grabber captures)
http://xv4y.radioclub.asia/2012/12/20/balise-qrss-synchrone-avec-le-launchpadmsp430/
- A RTC lib using the LaunchPad/MSP430 board
http://xv4y.radioclub.asia/2012/12/19/bibliotheque-rtc-pour-energia-version-1-02/
- An AD9850 DDS lib for Energia/MSP430 or Arduino
http://xv4y.radioclub.asia/2012/12/18/librairie-pour-piloter-un-dds-ad9850-avec-un-launchpadmsp430-ou-un-arduino/

If you are interested by the features but don't know from where to start, I offer kits in my online shop to help you to have a setup running and later modify it to your needs.
http://xv4y.radioclub.asia/boutique/?slug=product_info.php&cPath=22&products_id=30
http://xv4y.radioclub.asia/boutique/?slug=product_info.php&products_id=33

Wishing you best season greetings.
73,
Yan.
---
Yannick DEVOS - XV4Y
http://xv4y.radioclub.asia/

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[HamBrewers] Digital Interface for Sound card

 

Hi All

I have some Sound card Interfaces used for all digial modes and echolink interface.

Comes assembled in  a neat small case powder coated, 4 types of cables provided.

Those interested can email me directly.

OR call me on my mob :  9448332249

Thank you

best 73

Pop

VU2POP

 

 

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Sunday, November 25, 2012

[HamBrewers] Fw: [eu-amsat] 29 MHz Receiver

 

FYI. 
 
73
Nitin [VU3TYG]

----- Forwarded Message -----
From: Trevor . <m5aka@yahoo.co.uk>
To: AMSAT-EU Group <eu-amsat@yahoogroups.com>
Sent: Sunday, 25 November 2012 9:59 PM
Subject: [eu-amsat] 29 MHz Receiver
 
The circuit diagram of a 29 MHz receiver developed by David Bowman G0MRF to be part of a 29 to 145 MHz transponder can be downloaded from the AMSAT-UK website at:

http://www.uk.amsat.org/?page_id=11615

73 Trevor M5AKA
AMSAT-UK http://www.amsat-uk.org/
----

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Friday, November 23, 2012

[HamBrewers] Re: j-pole or dipole

 

Putting it in simply:

A dipole and J are the same. One is center fed and the J end fed.
Center fed is easier to mount horizontally than the J which is easier to handle vertically. FM communication is done vertically polarized.

--- In HamBrewers@yahoogroups.com, "darren" <dazzmos@...> wrote:
>
>
> Sorry its for 2 meter ......
> hhow is a j-pole better ?
> thanks
>
> --- In HamBrewers@yahoogroups.com, "darren" <dazzmos@> wrote:
> >
> > im very new & i want to build my own antenna
> > & used to be a plumber so have lots of copper tube
> > should i build a di pole or a j-pole ?
> > Many thanks
> >
>

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[HamBrewers] Re: j-pole or dipole

 


Sorry its for 2 meter ......
hhow is a j-pole better ?
thanks

--- In HamBrewers@yahoogroups.com, "darren" <dazzmos@...> wrote:
>
> im very new & i want to build my own antenna
> & used to be a plumber so have lots of copper tube
> should i build a di pole or a j-pole ?
> Many thanks
>

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Re: [HamBrewers] Question on Loop/ Delta Loop

 

His balanced-balanced tuner is a beauty with 2 ganged rotary inductors

See an article by Kirk A Kleinschmidt - nt0z in the April 2002 issue of QST.

Rajesh:  you should publish your implementation on the web ASAP.

On 11/23/2012 5:53 PM, Rajesh K wrote:
 

Only problem I face with this antenna is that it tests my patience (sometimes) while tuning, especially when switching bands….but I mastered the art in few weeks>>. Now I have an antenna which tunes continuously from 80 meters all the way up J.

 

From: Rajesh K [mailto:kc2kby@airtelmail.in]
Sent: Friday, November 23, 2012 5:48 PM
To: 'HamBrewers@yahoogroups.com'
Subject: RE: [HamBrewers] Question on Loop/ Delta Loop

 

Dear Madhukar,

 

I had similar problems at my QTH, compounded by noise from my PC also. I installed a dirty loop for an antenna and got rid of the problems 95%. I was able to bring down noise form 59+ down to 57. My setup is very simple. I put up 4 casuarina poles (with hooks on the top) on 4 corners of my terrace and ran longest possible loop – about 360 feet.  I used braid and center conductors from old coaxial cables. The loop terminates in V shaped formation from the top of 2 poles at nearest point to my shack. From the feed point, I run a ladder line (home brew) with 320 wires 1 inch apart separated by quarter inch rings of electrical pvc pipe. Length of feedline is approximately 15 feet. Ladder line connects to MFJ 901 tuner which has a balun inside. Balun is a must for this type of setup. "Balanced Balanced Tuner" is better (google it) if you want to homebrew a new tuner. If your LDG tuner has a built in balun (4:1 or 1:1 doesn't matter), you are OK. Otherwise, wind about 18 – 20 feet of RG213 or RG-58 on 4 inch PVC drain pipe (Close wind) and put it in between the rig and the tuner. If you don't want to run ladder line, terminate the loop in a dirty balun (coax wound on PVC) and run coax to your tuner. I tried both and had better performance with ladder line. My tuner tunes this antenna to all our bands (good thing is it is continuous from 80M up to 10 M J) and works best in 80, 40, 20 meters and little less perfect on upper bands. When the conditions were good last year (round about this time up to March-April), with just 40-50 W, I had many DX contacts including several from the other side of the globe in 20 and 40M. One variation you can try on this antenna is to have 2 shorter poles (about half of the other 2) and give some degree of "slant" to it. I  have the same antenna for about 2 years now and don't want to try anything else. Take care if you have any power lines running or transformer near your QTH. Also, add a power line filter before your PS. It helps a lot. Make sure you solder the joints if you have any in your antenna. If you put up lesser length loop, you will be able get better performance on higher bands. Try and get that slant if possible. Good luck and let me know how it goes.

 

73

Rajesh VU3RGK.

 

From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com] On Behalf Of Madhukar VU2MUD
Sent: Thursday, November 15, 2012 3:48 PM
To: HAMBREWERS Group
Subject: [HamBrewers] Question on Loop/ Delta Loop

 

 

I face a very high level of electrical noise at my new Permanent QTH - being just about 300 Mtrs from HT Lines - becoming a Permanent QRM too!!

 

This is present at unacceptable levels - s-9 + most of the times.  This made me consider a Loop/Delta Loop Antenna for 7 Mhz to handle the noise issue.

 

Planning for a Horizontal installation - I understand that this gives me only Ground Waves - OK for now.

 

I need clarifications on the following issues.

 

1. Most of the Links that I see on the web is for a full wave design.  What limits the use of a Half Wave Delta Loop??

2. Where should bthe feedpoint be?

3. What will be feedline impedence??

4. What kind of Balun is required to feed to a 50 Ohm cable?

5. What else is to be considered??

 

I have a LDG - Z-100 Plus antenna tuner. 

 

Madhukar – VU2MUD
Yahoo Mail: vu2mud@yahoo.co.uk
Gmail: vu2mud@gmail.com
General Blog: http://vu2mud.blogspot.com
Satellite Blog: http://workingtheoscars.blogspot.com
Location: Lat: 13° 0' 6'' N; Long: 77° 32' 10'' E;          
Grid Loc: MK83SA


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RE: [HamBrewers] Question on Loop/ Delta Loop

 

Only problem I face with this antenna is that it tests my patience (sometimes) while tuning, especially when switching bands….but I mastered the art in few weeks>>. Now I have an antenna which tunes continuously from 80 meters all the way up J.

 

From: Rajesh K [mailto:kc2kby@airtelmail.in]
Sent: Friday, November 23, 2012 5:48 PM
To: 'HamBrewers@yahoogroups.com'
Subject: RE: [HamBrewers] Question on Loop/ Delta Loop

 

Dear Madhukar,

 

I had similar problems at my QTH, compounded by noise from my PC also. I installed a dirty loop for an antenna and got rid of the problems 95%. I was able to bring down noise form 59+ down to 57. My setup is very simple. I put up 4 casuarina poles (with hooks on the top) on 4 corners of my terrace and ran longest possible loop – about 360 feet.  I used braid and center conductors from old coaxial cables. The loop terminates in V shaped formation from the top of 2 poles at nearest point to my shack. From the feed point, I run a ladder line (home brew) with 320 wires 1 inch apart separated by quarter inch rings of electrical pvc pipe. Length of feedline is approximately 15 feet. Ladder line connects to MFJ 901 tuner which has a balun inside. Balun is a must for this type of setup. "Balanced Balanced Tuner" is better (google it) if you want to homebrew a new tuner. If your LDG tuner has a built in balun (4:1 or 1:1 doesn't matter), you are OK. Otherwise, wind about 18 – 20 feet of RG213 or RG-58 on 4 inch PVC drain pipe (Close wind) and put it in between the rig and the tuner. If you don't want to run ladder line, terminate the loop in a dirty balun (coax wound on PVC) and run coax to your tuner. I tried both and had better performance with ladder line. My tuner tunes this antenna to all our bands (good thing is it is continuous from 80M up to 10 M J) and works best in 80, 40, 20 meters and little less perfect on upper bands. When the conditions were good last year (round about this time up to March-April), with just 40-50 W, I had many DX contacts including several from the other side of the globe in 20 and 40M. One variation you can try on this antenna is to have 2 shorter poles (about half of the other 2) and give some degree of "slant" to it. I  have the same antenna for about 2 years now and don't want to try anything else. Take care if you have any power lines running or transformer near your QTH. Also, add a power line filter before your PS. It helps a lot. Make sure you solder the joints if you have any in your antenna. If you put up lesser length loop, you will be able get better performance on higher bands. Try and get that slant if possible. Good luck and let me know how it goes.

 

73

Rajesh VU3RGK.

 

From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com] On Behalf Of Madhukar VU2MUD
Sent: Thursday, November 15, 2012 3:48 PM
To: HAMBREWERS Group
Subject: [HamBrewers] Question on Loop/ Delta Loop

 

 

I face a very high level of electrical noise at my new Permanent QTH - being just about 300 Mtrs from HT Lines - becoming a Permanent QRM too!!

 

This is present at unacceptable levels - s-9 + most of the times.  This made me consider a Loop/Delta Loop Antenna for 7 Mhz to handle the noise issue.

 

Planning for a Horizontal installation - I understand that this gives me only Ground Waves - OK for now.

 

I need clarifications on the following issues.

 

1. Most of the Links that I see on the web is for a full wave design.  What limits the use of a Half Wave Delta Loop??

2. Where should bthe feedpoint be?

3. What will be feedline impedence??

4. What kind of Balun is required to feed to a 50 Ohm cable?

5. What else is to be considered??

 

I have a LDG - Z-100 Plus antenna tuner. 

 

Madhukar – VU2MUD
Yahoo Mail: vu2mud@yahoo.co.uk
Gmail: vu2mud@gmail.com
General Blog: http://vu2mud.blogspot.com
Satellite Blog: http://workingtheoscars.blogspot.com
Location: Lat: 13° 0' 6'' N; Long: 77° 32' 10'' E;          
Grid Loc: MK83SA

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RE: [HamBrewers] Question on Loop/ Delta Loop

 

Dear Madhukar,

 

I had similar problems at my QTH, compounded by noise from my PC also. I installed a dirty loop for an antenna and got rid of the problems 95%. I was able to bring down noise form 59+ down to 57. My setup is very simple. I put up 4 casuarina poles (with hooks on the top) on 4 corners of my terrace and ran longest possible loop – about 360 feet.  I used braid and center conductors from old coaxial cables. The loop terminates in V shaped formation from the top of 2 poles at nearest point to my shack. From the feed point, I run a ladder line (home brew) with 320 wires 1 inch apart separated by quarter inch rings of electrical pvc pipe. Length of feedline is approximately 15 feet. Ladder line connects to MFJ 901 tuner which has a balun inside. Balun is a must for this type of setup. "Balanced Balanced Tuner" is better (google it) if you want to homebrew a new tuner. If your LDG tuner has a built in balun (4:1 or 1:1 doesn't matter), you are OK. Otherwise, wind about 18 – 20 feet of RG213 or RG-58 on 4 inch PVC drain pipe (Close wind) and put it in between the rig and the tuner. If you don't want to run ladder line, terminate the loop in a dirty balun (coax wound on PVC) and run coax to your tuner. I tried both and had better performance with ladder line. My tuner tunes this antenna to all our bands (good thing is it is continuous from 80M up to 10 M J) and works best in 80, 40, 20 meters and little less perfect on upper bands. When the conditions were good last year (round about this time up to March-April), with just 40-50 W, I had many DX contacts including several from the other side of the globe in 20 and 40M. One variation you can try on this antenna is to have 2 shorter poles (about half of the other 2) and give some degree of "slant" to it. I  have the same antenna for about 2 years now and don't want to try anything else. Take care if you have any power lines running or transformer near your QTH. Also, add a power line filter before your PS. It helps a lot. Make sure you solder the joints if you have any in your antenna. If you put up lesser length loop, you will be able get better performance on higher bands. Try and get that slant if possible. Good luck and let me know how it goes.

 

73

Rajesh VU3RGK.

 

From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com] On Behalf Of Madhukar VU2MUD
Sent: Thursday, November 15, 2012 3:48 PM
To: HAMBREWERS Group
Subject: [HamBrewers] Question on Loop/ Delta Loop

 

 

I face a very high level of electrical noise at my new Permanent QTH - being just about 300 Mtrs from HT Lines - becoming a Permanent QRM too!!

 

This is present at unacceptable levels - s-9 + most of the times.  This made me consider a Loop/Delta Loop Antenna for 7 Mhz to handle the noise issue.

 

Planning for a Horizontal installation - I understand that this gives me only Ground Waves - OK for now.

 

I need clarifications on the following issues.

 

1. Most of the Links that I see on the web is for a full wave design.  What limits the use of a Half Wave Delta Loop??

2. Where should bthe feedpoint be?

3. What will be feedline impedence??

4. What kind of Balun is required to feed to a 50 Ohm cable?

5. What else is to be considered??

 

I have a LDG - Z-100 Plus antenna tuner. 

 

Madhukar – VU2MUD
Yahoo Mail: vu2mud@yahoo.co.uk
Gmail: vu2mud@gmail.com
General Blog: http://vu2mud.blogspot.com
Satellite Blog: http://workingtheoscars.blogspot.com
Location: Lat: 13° 0' 6'' N; Long: 77° 32' 10'' E;          
Grid Loc: MK83SA

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[HamBrewers] Exploit

 


Read this, it explains how we get all these strange spam from Yahoo.

http://krebsonsecurity.com/2012/11/yahoo-email-stealing-exploit-fetches-700/

I reported it this earlier this year but no one was interested in exploring it !!

Cheers

--
Raj, vu2zap
Bengaluru, South India.

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Thursday, November 22, 2012

Re: [HamBrewers] j-pole or dipole

 

Following my experience, nothing you can notice in real conditions.

The advantage of the slim-jim is that with some materials it is easier to build.


Le 23 nov. 2012 à 11:47, Sajeesh Pilakkat a écrit :

Any difference in propagation angle - j-pole vs slim jim?
-vu3psz


Sent from Yahoo! Mail on Android



From: Raj <vu2zap@gmail.com>;
To: <HamBrewers@yahoogroups.com>;
Subject: Re: [HamBrewers] j-pole or dipole
Sent: Fri, Nov 23, 2012 4:21:18 AM

 

Hi Yan,

I built mine from 1/4" aluminium rods (easy to bend). The matching section was a slider mechanism that was made with a potentiometer locking collet nut like this. They were mounted on a bakelite strip along with the coax connector So-239. Turned up neat and easy to slide up down the matching section.

<4c9643.jpg>

Pic from here http://www.sdp-si.com/web/html/shaftacc.htm


At 23-11-2012, you wrote:

 

Hi Raj,

I agree, on VHF and higher the J-Pole rules.
You have to be a really rich plumber to build a copper J-Pole on 80m!!!

On HF, I build several ones with coax and twin-lead for 20m but it was rather deceptive.
Not bad, but no much advantages compared to a simple dipole and the disadvantage of 1/4 wave longer.

On VHF I also build a 2x5/8 colinear antenna based on a J-Pole. Easy to build and it has gain.
http://xv4y.radioclub.asia/xv4tuj-station-radioamateur-en-ok20ua/colineaire-j-pole-2x58-sur-144mhz/
http://xv4y.radioclub.asia/wp-content/uploads/2011/11/A1_Schema-5_8e.pdf

It was inspired by a Swedish or Danish article, but I lost the link...

73,
Yan.
---
Yannick DEVOS - XV4Y
http://xv4y.radioclub.asia/
http://varc.radioclub.asia/

Le 23 nov. 2012 à 10:08, Raj a écrit :

> I presume it is for VHF then I would chose a J pole.
>
> Raj, vu2zap
>
> At 23-11-2012, you wrote:
>>
>>
>> im very new & i want to build my own antenna
>> & used to be a plumber so have lots of copper tube
>> should i build a di pole or a j-pole ?
>> Many thanks
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>



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