Wednesday, May 30, 2012

Re: [HamBrewers] Re: VU Based rig

 


Ravi,

The SDR2GO coould be considered as an add-on to the base SDR transceiver as its cost 9$80 international) is more or less same as the Ensemble RxTx itself. Per their website "This unit takes the place of the computer and uses an existing I/Q front-end such as a SoftRock RxTx, SoftRock Ensemble RxTx, UHFSDR, and others."

It would be best to have a single cabinet which would take only an SDR TxRx and later if required an add-on SDR2GO module. This way a ham who already has a computer can use that to check out the rig, make QSOs and then opt for the freedom that something like an SDR2GO could offer.

An outboard amplifier unit with switched BPFs could be the 3rd option to be added on in due course. SPace could also be provisioned in the main cabinet itself.

I have a couple of Ensemble kits, a HF RxTx and a 6m Rx - now to try and find time to build them :)

73 de Prasad VU2PTT


On Wed, May 30, 2012 at 10:46 PM, ravimiranda <ravimiranda@yahoo.com> wrote:
 

Dear VU2PTT

Excellent idea. I have bought one Ensemble kit and am halfway through the process. I am following the process of building each stage and testing it as I go along.

Will post the results here once they are ready. Agree with your view on multibanding /switched.

There have been discussions that we should find a way to try the SDR2GO as another model to avoid the use of the PC.

What are your thoughts on a stand-alone SDR?

I am also in favour of avoiding too much FOREX outflow :-) The Dollar is much more dearer. Components should be easily sourced in VU land/Eastern world?
Toroids etc we can see alternatives.

Will keep posting once a direction is established.

Kind regards

Ravi Miranda

Believe each human being has the potential to change, to transform one's own attitude, no matter how difficult the situation." - Dalai Lama



--- In HamBrewers@yahoogroups.com, Prasad VU2PTT <vu2ptt@...> wrote:
>
> Folks:
>
> While I am completely swamped for time, please do have a good look at
> KB9YIG's proven SoftRock RXTX Ensemble Transceiver Kit documentation while
> evaluating currently available kits.
>
> The description from the website - "The SoftRock RXTX Ensemble Transceiver
> Kit provides a 1 watt SDR transceiver that can be built for one of the
> following four band groups: 160m, 80m/40m, 30m/20m/17m or 15m/12m/10m.
> Components are included for all four options and can be assembled at the
> builders choice. The kit combines the functionality of the prior SoftRock
> v6.3 RXTX+Xtall Transceiver Kit, the USB I2C Interface Kit and the PA
> Filter Kit on a single circuit board with connectors along one edge for
> easy access."
>
>
> This could be a good base for less than Rs. 5,000 if we get
> the components as a kit from there - but it may be much cheaper if kitting
> is done here. A great step up would be if all bands could be provided using
> the same base design with some filter switching.
>
>
> Good luck and 73 de Prasad VU2PTT
>
>
> On Wed, May 30, 2012 at 12:51 AM, ravimiranda <ravimiranda@...> wrote:
>
> > **

> >
> >
> > Hello
> >
> > We have 5 members on the team of building a VU based SDR on the lines of
> > those available in DX land.
> >
> > Would some others like to join and support the effort? This will be open
> > community
> >
> > 73
> >
> > Ravi
> >
> >
> >
>
>
>
> --
>
> 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
>




--

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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[HamBrewers] Re: VU Based rig

 

Dear VU2PTT

Excellent idea. I have bought one Ensemble kit and am halfway through the process. I am following the process of building each stage and testing it as I go along.

Will post the results here once they are ready. Agree with your view on multibanding /switched.

There have been discussions that we should find a way to try the SDR2GO as another model to avoid the use of the PC.

What are your thoughts on a stand-alone SDR?

I am also in favour of avoiding too much FOREX outflow :-) The Dollar is much more dearer. Components should be easily sourced in VU land/Eastern world?
Toroids etc we can see alternatives.

Will keep posting once a direction is established.

Kind regards

Ravi Miranda

Believe each human being has the potential to change, to transform one's own attitude, no matter how difficult the situation." - Dalai Lama

--- In HamBrewers@yahoogroups.com, Prasad VU2PTT <vu2ptt@...> wrote:
>
> Folks:
>
> While I am completely swamped for time, please do have a good look at
> KB9YIG's proven SoftRock RXTX Ensemble Transceiver Kit documentation while
> evaluating currently available kits.
>
> The description from the website - "The SoftRock RXTX Ensemble Transceiver
> Kit provides a 1 watt SDR transceiver that can be built for one of the
> following four band groups: 160m, 80m/40m, 30m/20m/17m or 15m/12m/10m.
> Components are included for all four options and can be assembled at the
> builders choice. The kit combines the functionality of the prior SoftRock
> v6.3 RXTX+Xtall Transceiver Kit, the USB I2C Interface Kit and the PA
> Filter Kit on a single circuit board with connectors along one edge for
> easy access."
>
>
> This could be a good base for less than Rs. 5,000 if we get
> the components as a kit from there - but it may be much cheaper if kitting
> is done here. A great step up would be if all bands could be provided using
> the same base design with some filter switching.
>
>
> Good luck and 73 de Prasad VU2PTT
>
>
> On Wed, May 30, 2012 at 12:51 AM, ravimiranda <ravimiranda@...> wrote:
>
> > **
> >
> >
> > Hello
> >
> > We have 5 members on the team of building a VU based SDR on the lines of
> > those available in DX land.
> >
> > Would some others like to join and support the effort? This will be open
> > community
> >
> > 73
> >
> > Ravi
> >
> >
> >
>
>
>
> --
>
> 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] VU Based rig

 


Folks:

While I am completely swamped for time, please do have a good look at KB9YIG's proven SoftRock RXTX Ensemble Transceiver Kit documentation while evaluating currently available kits.

The description from the website - "The SoftRock RXTX Ensemble Transceiver Kit provides a 1 watt SDR transceiver that can be built for one of the following four band groups: 160m, 80m/40m, 30m/20m/17m or 15m/12m/10m. Components are included for all four options and can be assembled at the builders choice. The kit combines the functionality of the prior SoftRock v6.3 RXTX+Xtall Transceiver Kit, the USB I2C Interface Kit and the PA Filter Kit on a single circuit board with connectors along one edge for easy access."


This could be a good base for less than Rs. 5,000 if we get the components as a kit from there - but it may be much cheaper if kitting is done here. A great step up would be if all bands could be provided using the same base design with some filter switching.


Good luck and 73 de Prasad VU2PTT



On Wed, May 30, 2012 at 12:51 AM, ravimiranda <ravimiranda@yahoo.com> wrote:
 

Hello

We have 5 members on the team of building a VU based SDR on the lines of those available in DX land.

Would some others like to join and support the effort? This will be open community

73

Ravi




--

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] VU Based rig

 

Good Effort ! I am in  :-).


--
Rakesh Mishra
   
 VU3PUA

Bhopal,(M.P.)

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Tuesday, May 29, 2012

Re: [HamBrewers] VU Based rig

 

Good going.
M already in those 5. :-)
anybody else?

On 30/05/2012, ravimiranda <ravimiranda@yahoo.com> wrote:
> Hello
>
> We have 5 members on the team of building a VU based SDR on the lines of
> those available in DX land.
>
> Would some others like to join and support the effort? This will be open
> community
>
> 73
>
> Ravi
>
>

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[HamBrewers] VU Based rig

 

Hello

We have 5 members on the team of building a VU based SDR on the lines of those available in DX land.

Would some others like to join and support the effort? This will be open community

73

Ravi

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Saturday, May 26, 2012

[HamBrewers] New file uploaded to HamBrewers

 


Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the HamBrewers
group.

File : /Homebrew Rotary Encoder.pdf
Uploaded by : vu2pop <vu2pop@gmail.com>
Description : Homebrew Rotary Encoder

You can access this file at the URL:
http://groups.yahoo.com/group/HamBrewers/files/Homebrew%20Rotary%20Encoder.pdf

To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html
Regards,

vu2pop <vu2pop@gmail.com>


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Friday, May 25, 2012

RE: [HamBrewers] Re: Nice and simple home brew rotary encoder [1 Attachment]

 
[Attachment(s) from VU2POP included below]

Hi

Heres a picture of a similar project done by me in 2002 for my first version DDS

Salvage from the mouse , LEDs and the wheel attached it  to the ten turn bourns pot shell  (pot was  qrt.. )

Though I have built the newer versions of DDS even this day I have it working fine.

Best 73

Pop

VU2POP

 

 

From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com] On Behalf Of Raj
Sent: Friday, May 25, 2012 4:13 PM
To: HamBrewers@yahoogroups.com
Subject: Re: [HamBrewers] Re: Nice and simple home brew rotary encoder [1 Attachment]

 

 

[Attachment(s) from Raj included below]

Link Work fine Rakesh, here it is anyway..

Nice homebrew work!

At 25-05-2012, you wrote:

 


Can't see the Encoder . The link : http://groups.yahoo.com/group/HamBrewers/message/3292
Returns BLANK PAGE .
73s
Rakesh
--- In HamBrewers@yahoogroups.com, Pramod <vu2ttp@...> wrote:
>
> Came across this nice and simple encoder project.
>
> 73
> vu2ttp

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Attachment(s) from VU2POP

1 of 1 Photo(s)

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Re: [HamBrewers] Re: Nice and simple home brew rotary encoder [1 Attachment]

 
[Attachment(s) from Raj included below]

Link Work fine Rakesh, here it is anyway..

Nice homebrew work!

At 25-05-2012, you wrote:

 


Can't see the Encoder . The link : http://groups.yahoo.com/group/HamBrewers/message/3292
Returns BLANK PAGE .
73s
Rakesh
--- In HamBrewers@yahoogroups.com, Pramod <vu2ttp@...> wrote:
>
> Came across this nice and simple encoder project.
>
> 73
> vu2ttp

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Attachment(s) from Raj

1 of 1 File(s)

Rotary Encoder.pdf
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[HamBrewers] Re: Nice and simple home brew rotary encoder

 


Can't see the Encoder . The link : http://groups.yahoo.com/group/HamBrewers/message/3292
Returns BLANK PAGE .
73s
Rakesh
--- In HamBrewers@yahoogroups.com, Pramod <vu2ttp@...> wrote:
>
> Came across this nice and simple encoder project.
>
> 73
> vu2ttp
>

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[HamBrewers] Nice and simple home brew rotary encoder [1 Attachment]

 
[Attachment(s) from Pramod included below]

Came across this nice and simple encoder project.


73
vu2ttp

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Attachment(s) from Pramod

1 of 1 File(s)

Rotary%20Encoder.pdf
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Monday, May 21, 2012

[HamBrewers] You Built What?!: A Portable X-Ray Machine

 
.

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[HamBrewers] Re: Permeability tuned VFO

 

Brian,
In the late 70s and 80s a lot of car radios manufactured by the Japanese before the PLL LSI chips became popular used a lot of these PTO tuned oscillators to cover MW and SW bands. I guess this was primarily done to avoid frequency jumping on bumpy roads!!

I had a unit that was hardly 1.5 X 1.5 x 2 inch assembly that had a shaft with 4 ferrite cores mounted on it. When you turned the shaft, these 4 cores moved in and out of 4 independent coils of 8mm dia and 25mm length. I guess it was a simple and elegant way to maintain the same bandspread and tuning linearity on all the different bands.

JRC took the collins approach to the next level in their NRD-505 receiver in the 70s, this RX had a PLL that utilized a PTO tuned oscillator.

On the internet you find a lot of homebrew PTO projects based on the lipstick idea, I suggest you take a look at the internal construction
details of the collins PTO.

http://www.radiomuseum.org/forum/design_excellence_the_collins_pto.html

73s
Pramod
vu2ttp

--- In HamBrewers@yahoogroups.com, Brian Burns <burnsguitar@...> wrote:
>
> Hello Raj,
>
> ~ You could look up the manual / schematic of Collins 51J4 (old boat anchor) which is a permeability tuned receiver.
>
> I have looked at schematics for commercially made equipment, and Collins is certainly the permeability tuned king. The sort of info I'm looking for is the do-it-myself kind of thing--coil diameter, spacing of turns, slug type etc.
>
> One idea that I've had is to use a ferrite slug and a brass slug in tandem to extend the tuning range of a PTO VFO, without band switching. If the ferrite slug were fully inserted in the coil for the lowest frequency, and as it is withdrawn, the brass slug comes into the coil to raise the resonant frequency, it might be possible to extend the tuning range enough to provide coverage of WARC bands. It's basic design information as a place to start that I'm looking for.
>
> ~ Great guitar homebrewing Brian!
>
> Thanks very much, but I'm afraid that it has gotten rather out of hand! Since I'm trying to set up for one man production of guitars, I would have to call it commercial-brewing (:->)...
>
> I gave guitar making 5 years back in the early 1960's and failed utterly. I returned to it in 1993, and finished up a couple of flamencos from parts that I still had on hand. One turned out spectacularly well, but I didn't know what I had done right!
>
> I took eight orders off that guitar before I realized that I needed to get the process figured out before trying to reproduce it. So, a long period of sporadic research has ensued, and a year ago last November I finally came up with a method of accurately adjusting the frequencies of the natural resonances of the guitar body.
>
> The process is called "voicing" and it consists of moving resonances to positions in the guitars' range that result in the tone you want. This mostly covers bass and mid-range frequencies. Wood selection using mechanical and Q testing, plus body size and bracing pattern design, have the most effect on the treble response.
>
> I have a bunch of photo .pdf's that are notes on the process for my guitar making students. I can send them along to anyone that's interested, as attachments.
>
> Cheers,
>
> Brian
>

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Sunday, May 20, 2012

Re: [HamBrewers] Permeability tuned VFO--P.S.

 

I forgot to put in my contact info:

See my website at :  www.lessonsinlutherie.com

Craftsman Graphics
18000 George's Lane
Fort Bragg, CA  95437

Toll Free: 866-214-9472

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Re: [HamBrewers] Permeability tuned VFO

 

Hello Raj,

~ You could look up the manual / schematic of Collins 51J4 (old boat anchor) which is a permeability tuned receiver.

I have looked at schematics for commercially made equipment, and Collins is certainly the permeability tuned king. The sort of info I'm looking for is the do-it-myself kind of thing--coil diameter, spacing of turns, slug type etc.

One idea that I've had is to use a ferrite slug and a brass slug in tandem to extend the tuning range of a PTO VFO, without band switching. If the ferrite slug were fully inserted in the coil for the lowest frequency, and as it is withdrawn, the brass slug comes into the coil to raise the resonant frequency, it might be possible to extend the tuning range enough to provide coverage of WARC bands. It's basic design information as a place to start that I'm looking for.

~ Great guitar homebrewing Brian!

Thanks very much, but I'm afraid that it has gotten rather out of hand! Since I'm trying to set up for one man production of guitars, I would have to call it commercial-brewing (:->)...

I gave guitar making 5 years back in the early 1960's and failed utterly. I returned to it in 1993, and finished up a couple of flamencos from parts that I still had on hand. One turned out spectacularly well, but I didn't know what I had done right!

I took eight orders off that guitar before I realized that I needed to get the process figured out before trying to reproduce it. So, a long period of sporadic research has ensued, and a year ago last November I finally came up with a method of accurately adjusting the frequencies of the natural resonances of the guitar body.

The process is called "voicing" and it consists of moving resonances to positions in the guitars' range that result in the tone you want. This mostly covers bass and mid-range frequencies. Wood selection using mechanical and Q testing, plus body size and bracing pattern design, have the most effect on the treble response.

I have a bunch of photo .pdf's that are notes on the process for my guitar making students. I can send them along to anyone that's interested, as attachments.

Cheers,

Brian

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