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:
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Collection Ham radio Homebrew discussions,useful tips,instructions,circuits,projects etc
Tuesday, November 29, 2011
Re: [HamBrewers] stable 7mhz vfo
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:
|
[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
Saturday, November 26, 2011
[HamBrewers] Available for sale :- SS-30M ( 25A Continuos and 30A ICS) Astron Switching Power Supply
Friday, November 25, 2011
Re: [HamBrewers] RE: HOME BREW innovative
----- Original Message -----From: Namachivayam GanesanTo: hambrewrsSent: Thursday, November 24, 2011 9:06 PMSubject: [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
Re: [HamBrewers] Re: 2kw HF linear amplifier made in China
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.
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
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 ****
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
Re: [HamBrewers] 2kw HF linear amplifier made in China
To: HamBrewers@yahoogroups.com
Sent: Friday, 25 November 2011 4:10 PM
Subject: Re: [HamBrewers] 2kw HF linear amplifier made in China
Hi raj,Le 24 nov. 2011 à 14:52, Raj a écrit :
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
>
>
> 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/
>
>
>
Re: [HamBrewers] 2kw HF linear amplifier made in China
Hi raj,
Le 24 nov. 2011 à 14:52, Raj a écrit :
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
>
>
> 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/
>
>
>
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
>
>
>