Tuesday, November 29, 2011

Re: [HamBrewers] stable 7mhz vfo

 

Dear Kishore,
 
 Pls use AD9833 , a very low cost DDS IC ( Farnell sells for Rs.560=00) and if you donot need a freq. display then any small microcontroller would interface with that IC. Only three lines to be connected, you see. Something like a Rs65=00 IC,16F628 would not only drive the DDS but also can drive a LCD Display! For some details you could visit our Blog:
 
  http://hamrmipl.blogspot.com/ and we have put a picture or two of the experiment.
 
 Suggest running the DDS with 25MHz Cystal clock. And 16F628 can run on its own internal clock,
 
 Sorry for a long over.
 
 73s
 
 dev     

--- On Tue, 11/29/11, kishore <kishorev001@yahoo.co.in> wrote:

From: kishore <kishorev001@yahoo.co.in>
Subject: [HamBrewers] stable 7mhz vfo
To: HamBrewers@yahoogroups.com
Date: Tuesday, November 29, 2011, 9:28 PM

hello group,
i have recently joined this group for i have liking for homebrewing. however i have been trying hard to make a 7mhz vfo whose output rf voltage should be more than 0.7 volts.
can any group member help me with such vfo circuits?
73
v kishore
vu2-002swl



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Re: [HamBrewers] stable 7mhz vfo

 

Hi Kishore,
 
Please check on the below link.
 
 
73'es,
de Siddhu VU3NXI


--- On Tue, 11/29/11, kishore <kishorev001@yahoo.co.in> wrote:

From: kishore <kishorev001@yahoo.co.in>
Subject: [HamBrewers] stable 7mhz vfo
To: HamBrewers@yahoogroups.com
Date: Tuesday, November 29, 2011, 9:58 AM

 
hello group,
i have recently joined this group for i have liking for homebrewing. however i have been trying hard to make a 7mhz vfo whose output rf voltage should be more than 0.7 volts.
can any group member help me with such vfo circuits?
73
v kishore
vu2-002swl

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Posted by at No comments:

[HamBrewers] stable 7mhz vfo

 

hello group,
i have recently joined this group for i have liking for homebrewing. however i have been trying hard to make a 7mhz vfo whose output rf voltage should be more than 0.7 volts.
can any group member help me with such vfo circuits?
73
v kishore
vu2-002swl

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Saturday, November 26, 2011

[HamBrewers] Available for sale :- SS-30M ( 25A Continuos and 30A ICS) Astron Switching Power Supply

 

 
Anybody interested in buying ????
 
Available for sale :- SS-30M ( 25A Continuos and 30A ICS) Astron Switching Power Supply
 
Price Rs.10,000 (Hurry, first come first served)
 
Made in USA.
 
Single piece sparringly used, available with original box packing and in brand new condition.
Good to use for VHF/HF base, low weight (2.28kg)
Reason for selling :- Not being used much, since there is one more P.S with me.
Please contact on the below number if you are interested.
0 96292 30576

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Friday, November 25, 2011

Re: [HamBrewers] RE: HOME BREW innovative

 

Good piece of ART
maye we can do that with all the qrt components instead of just chucking into the dustbin
Best 73
Pop
VU2POP
 
----- Original Message -----
Sent: Thursday, November 24, 2011 9:06 PM
Subject: [HamBrewers] RE: HOME BREW innovative [1 Attachment]

 

Dear friends,
 
I came across this picture, very nice innovative.
 
the guy designed this should be  mectronics engineer.
 
hats off to this unknown designer.
 
73,
N.Ganesan

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Re: [HamBrewers] Re: 2kw HF linear amplifier made in China

 

Pramod, 

You are right about cheap products from China. China has a long way to go before they will produce real quality products. December QST has review of BAOFENG UV-3R 2m/70cm handheld transceiver and the report shows high spurious emissions 15dB below the fundamental on low power mode. It pushed out a 790uW second harmonic when it was on low power mode pushing out 25mW on 144 MHz. When on high power mode (2W) the second harmonic was 1.25mW or just 32 dB below. They tested two radios and both radios failed FCC spurious emission test on 2m band. QST editors did not consider it fit for publishing this review in the "review" section but put it in the technical correspondence section as a 3/4 page story. 

73
Prasad VU2AEA, AB3EH



From: Pramod <vu2ttp@gmail.com>
To: HamBrewers@yahoogroups.com
Sent: Friday, November 25, 2011 4:56 AM
Subject: [HamBrewers] Re: 2kw HF linear amplifier made in China


That looks like a  (cheap) copy of the Alpha 8400. Even the alpha amp uses a pair of  the same chinese tubes, these tubes are considered drop in replacements for the expensive Eimac 4cx1000 tubes. Looks like the chinese have come a long way from the lead paint loaded toys and the mosquito bats to almost everything in extreme engineering.

73s
vu2ttp




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Re: [HamBrewers] 2kw HF linear amplifier made in China

 

there is one particular model from RM Italy, which is a full fledged amp for ham radio usage. it has band pass filters and operates with 13.8 volts. there are three exhaust fans also for
controlling the heat, more from here.


this amp works on the rf sense principle and only needs an rf input of 10 watts which even an rm96 can do and will produce about 450 watts out.

73s
vu3mes
 


On 25 November 2011 17:09, Raj <vu2zap@gmail.com> wrote:
 

I have one like these. It has no filter! Output is full of spurs and harmonics. Has two FETs for the finals.


There are some making solid state linear in China mainly for CB, but i found one which states HF. Looks similar to the RM series of amps.
 
http://qzbaojie.en.made-in-china.com/product/UoJmLrXdYCcn/China-Wireless-Amplifier-Power-Amplifier-BJ-300-.html
 
73's
Nitin [VU3TYG]

From: Prasad VU2PTT <vu2ptt@gmail.com>
To: HamBrewers@yahoogroups.com
Sent: Friday, 25 November 2011 4:10 PM
Subject: Re: [HamBrewers] 2kw HF linear amplifier made in China

 

Some more details from a friend in BY land - I quote him verbatim below:

About the amp, the models are HF2000DX, HF2010DX, AND HF2011DX-A.  The specs are almost the same with OM series (please check out the website: http://www.om-power.com/ for more information). HF2000DX=OM 2500HF, HF2011DX-A= OM2500A, The price is about 20K RMB (HF2000DX) and 30K RMB (HF2011DX-A), HF2010DX = HF2000DX + a 4 line antenna switch, I'm not clear about the price for that, maybe it's around 1K - 2K more than HF2000DX.  Currently the exchange rate for RMB/USD is about 1usd = 6.35 RMB.  So I think you can get the rough idea about these amplifiers now.
 
But I don't know whether they can ship it to you country or not, and also have no idea about the shipping cost...
 

On Thu, Nov 24, 2011 at 1:28 PM, Yannick (XV4Y) <yannick.devos@online.fr > wrote:
 
Hi raj,

FU728

Here more details. It is in french but with automatic translation you should understand :
http://j28ro.blogspot.com/2011/11/amplificateurs-hf-chinois-3.html


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

Le 24 nov. 2011 à 14:52, Raj a écrit :


>
>
> Looks good, wonder what tube is in it.
>
>
>> http://www.cqdx.ru/ham/?gallery=rf-linear-amplifiers-from-china-in-pics
>>
>> 73,
>> Yan.
>> ---
>> Yannick DEVOS - XV4Y
>> http://xv4y.radioclub.asia/
>> http://varc.radioclub.asia/
>
>
>




--

73 de Prasad VU2PTT, W2PTT (ex-AF6DV)

ARSI, ARRL, FOC, CWOPS
NCDXF, INDEXA, SCCC, EUPSK
ARRL DXCC Card Checker, MARC
Contest Manager - ARSI www.arsi.info
Coordinator - VU Contest Group www.vucg.org
Webmaster - Logger32 www.logger32.net







--
73s de vu3mes satyan sarath qth link -
http://www.findu.com/cgi-bin/find.cgi?call=vu3mes  www.qrz.com/callsign/vu3mes  www.chennaihams.blogspot.com
www.satyansarath.param.mobi [mobile webpage]
 ****    ham radio - one world - one language  ****



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Re: [HamBrewers] 2kw HF linear amplifier made in China

 

I have one like these. It has no filter! Output is full of spurs and harmonics. Has two FETs for the finals.


There are some making solid state linear in China mainly for CB, but i found one which states HF. Looks similar to the RM series of amps.
 
http://qzbaojie.en.made-in-china.com/product/UoJmLrXdYCcn/China-Wireless-Amplifier-Power-Amplifier-BJ-300-.html
 
73's
Nitin [VU3TYG]

From: Prasad VU2PTT <vu2ptt@gmail.com>
To: HamBrewers@yahoogroups.com
Sent: Friday, 25 November 2011 4:10 PM
Subject: Re: [HamBrewers] 2kw HF linear amplifier made in China

 

Some more details from a friend in BY land - I quote him verbatim below:

About the amp, the models are HF2000DX, HF2010DX, AND HF2011DX-A.  The specs are almost the same with OM series (please check out the website: http://www.om-power.com/ for more information). HF2000DX=OM 2500HF, HF2011DX-A= OM2500A, The price is about 20K RMB (HF2000DX) and 30K RMB (HF2011DX-A), HF2010DX = HF2000DX + a 4 line antenna switch, I'm not clear about the price for that, maybe it's around 1K - 2K more than HF2000DX.  Currently the exchange rate for RMB/USD is about 1usd = 6.35 RMB.  So I think you can get the rough idea about these amplifiers now.
 
But I don't know whether they can ship it to you country or not, and also have no idea about the shipping cost...
 

On Thu, Nov 24, 2011 at 1:28 PM, Yannick (XV4Y) <yannick.devos@online.fr > wrote:
 
Hi raj,

FU728

Here more details. It is in french but with automatic translation you should understand :
http://j28ro.blogspot.com/2011/11/amplificateurs-hf-chinois-3.html


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

Le 24 nov. 2011 à 14:52, Raj a écrit :


>
>
> Looks good, wonder what tube is in it.
>
>
>> http://www.cqdx.ru/ham/?gallery=rf-linear-amplifiers-from-china-in-pics
>>
>> 73,
>> Yan.
>> ---
>> Yannick DEVOS - XV4Y
>> http://xv4y.radioclub.asia/
>> http://varc.radioclub.asia/
>
>
>




--

73 de Prasad VU2PTT, W2PTT (ex-AF6DV)

ARSI, ARRL, FOC, CWOPS
NCDXF, INDEXA, SCCC, EUPSK
ARRL DXCC Card Checker, MARC
Contest Manager - ARSI www.arsi.info
Coordinator - VU Contest Group www.vucg.org
Webmaster - Logger32 www.logger32.net




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Posted by at No comments:

Re: [HamBrewers] 2kw HF linear amplifier made in China

 

There are some making solid state linear in China mainly for CB, but i found one which states HF. Looks similar to the RM series of amps.
 
 
73's
Nitin [VU3TYG]

From: Prasad VU2PTT <vu2ptt@gmail.com>
To: HamBrewers@yahoogroups.com
Sent: Friday, 25 November 2011 4:10 PM
Subject: Re: [HamBrewers] 2kw HF linear amplifier made in China

 

Some more details from a friend in BY land - I quote him verbatim below:

About the amp, the models are HF2000DX, HF2010DX, AND HF2011DX-A.  The specs are almost the same with OM series (please check out the website: http://www.om-power.com/ for more information). HF2000DX=OM 2500HF, HF2011DX-A= OM2500A, The price is about 20K RMB (HF2000DX) and 30K RMB (HF2011DX-A), HF2010DX = HF2000DX + a 4 line antenna switch, I'm not clear about the price for that, maybe it's around 1K - 2K more than HF2000DX.  Currently the exchange rate for RMB/USD is about 1usd = 6.35 RMB.  So I think you can get the rough idea about these amplifiers now.
 
But I don't know whether they can ship it to you country or not, and also have no idea about the shipping cost...
 

On Thu, Nov 24, 2011 at 1:28 PM, Yannick (XV4Y) <yannick.devos@online.fr> wrote:
 
Hi raj,

FU728

Here more details. It is in french but with automatic translation you should understand :
http://j28ro.blogspot.com/2011/11/amplificateurs-hf-chinois-3.html


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

Le 24 nov. 2011 à 14:52, Raj a écrit :


>
>
> Looks good, wonder what tube is in it.
>
>
>> http://www.cqdx.ru/ham/?gallery=rf-linear-amplifiers-from-china-in-pics
>>
>> 73,
>> Yan.
>> ---
>> Yannick DEVOS - XV4Y
>> http://xv4y.radioclub.asia/
>> http://varc.radioclub.asia/
>
>
>




--

73 de Prasad VU2PTT, W2PTT (ex-AF6DV)

ARSI, ARRL, FOC, CWOPS
NCDXF, INDEXA, SCCC, EUPSK
ARRL DXCC Card Checker, MARC
Contest Manager - ARSI www.arsi.info
Coordinator - VU Contest Group www.vucg.org
Webmaster - Logger32 www.logger32.net




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Posted by at No comments:

Re: [HamBrewers] 2kw HF linear amplifier made in China

 


Some more details from a friend in BY land - I quote him verbatim below:

About the amp, the models are HF2000DX, HF2010DX, AND HF2011DX-A.  The specs are almost the same with OM series (please check out the website: http://www.om-power.com/ for more information). HF2000DX=OM 2500HF, HF2011DX-A= OM2500A, The price is about 20K RMB (HF2000DX) and 30K RMB (HF2011DX-A), HF2010DX = HF2000DX + a 4 line antenna switch, I'm not clear about the price for that, maybe it's around 1K - 2K more than HF2000DX.  Currently the exchange rate for RMB/USD is about 1usd = 6.35 RMB.  So I think you can get the rough idea about these amplifiers now.
 
But I don't know whether they can ship it to you country or not, and also have no idea about the shipping cost...
 

On Thu, Nov 24, 2011 at 1:28 PM, Yannick (XV4Y) <yannick.devos@online.fr> wrote:
 

Hi raj,

FU728

Here more details. It is in french but with automatic translation you should understand :
http://j28ro.blogspot.com/2011/11/amplificateurs-hf-chinois-3.html



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

Le 24 nov. 2011 à 14:52, Raj a écrit :


>
>
> Looks good, wonder what tube is in it.
>
>
>> http://www.cqdx.ru/ham/?gallery=rf-linear-amplifiers-from-china-in-pics
>>
>> 73,
>> Yan.
>> ---
>> Yannick DEVOS - XV4Y
>> http://xv4y.radioclub.asia/
>> http://varc.radioclub.asia/
>
>
>




--

73 de Prasad VU2PTT, W2PTT (ex-AF6DV)

ARSI, ARRL, FOC, CWOPS
NCDXF, INDEXA, SCCC, EUPSK
ARRL DXCC Card Checker, MARC
Contest Manager - ARSI www.arsi.info
Coordinator - VU Contest Group www.vucg.org
Webmaster - Logger32 www.logger32.net


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Re: [HamBrewers] Re: 2kw HF linear amplifier made in China

 

Yes. You can find really high quality and technology stuff made in China.
Two problems : quality control and specification respect along a long time period...
At that time speaking of this amplifier they are willing to offer long time warranty for the amplifier and 1 year for the tube.
Like in Vietnamese culture, with confucianism they learn how to do "more", "cheaper" but "better" is too subjective.
---
Yannick DEVOS - XV4Y
http://xv4y.radioclub.asia/
http://varc.radioclub.asia/

Le 25 nov. 2011 à 16:56, Pramod a écrit :

>
>
> That looks like a (cheap) copy of the Alpha 8400. Even the alpha amp uses a pair of the same chinese tubes, these tubes are considered drop in replacements for the expensive Eimac 4cx1000 tubes. Looks like the chinese have come a long way from the lead paint loaded toys and the mosquito bats to almost everything in extreme engineering.
>
> 73s
> vu2ttp
>
>
>

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