Friday, July 29, 2011

=?windows-1252?Q?Yahoo! Mail is upgrading: What it means for you.?=

Yahoo!

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Thursday, July 28, 2011

[HamBrewers] HERMES Technical parameters

 

 

 

 

Video:

 

http://www.youtube.com/watch?v=NyYRs8dzapY

 

 

HERMES: Technical details

 

Transmit and receiver image rejection > 110dB

Full duplex operation, any split over entire 160m to 6m range

Future expansion possible to eight independent receivers using the same antenna

500mW RF output on 160 – 6m amateur bands

Built-in high performance preamp, with a noise floor typically -135dBm in 500Hz

Software-selectable 31dB input attenuator in 1dB steps

High performance receiver – same specifications as the HPSDR Mercury receiver

(ie Blocking Dynamic Range typically about 125dB)

FPGA code can be updated via the Industry Standard TCP/IP network Ethernet

connection

Seven user-configurable open-collector outputs, independently selectable per

band and Tx/Rx (for relay control, etc - with sequencing via PC code)

Separate open-collector PTT connection for amplifier control, etc, with sequencer

Microphone PTT jumper-selectable from tip or ring connection

Bias for electret microphones via jumper

Four user-configurable 12 bit analogue inputs (for ALC, SWR etc)

Three user-configurable digital inputs (for linear amplifier over temperature, etc)

Optional in-built switch mode power supply – less than xxxmA (receive) from a

13.8V supply

I2C bus connector for control of external equipment

Full QSK using the Kiss Konsole software, since digital signal processing is not

used in the controlling PC for CW carrier generation

Low-level transmitter output for transverter use (0dBm) as well as user-selectable

output attenuator

Stereo audio outputs at line and headphone levels

In-built 1W stereo audio amplifier for directly driving speakers

Direct, de-bounced connections for a Morse key (straight or iambic) and PTT

122.88MHz master clock, which can be phase-locked to an internal 10MHz

TCXO or external frequency reference

Jumper-selectable external frequency reference, with signal processing, to suit numerous

GPS-locked 10MHz reference sources

Direct ribbon cable interface to Apollo 15W power amplifier, low pass filters and

automatic ATU.

Low noise, high efficiency, Switching Power Supply designed by Kjell

Karson,LA2NI

 
 
 
 

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[HamBrewers] Hermes the new HPSDR is Alive

 

Dear Friends,
 
Hermes the latest HPSDR  digital all mode HF + 6 Mtr SDR transciever  prototype has been assembled by Abhi Arunoday (Consultant) ,Dept of Science and Technology, Govt of India, who has also designed the 8 layer PCB of the transciever. The performance is at par or exceeds top notch mega buck rigs.
 
Rig is soon expected to be distributed by TAPR.
 
For more information:
 
 
 
 
73's
 
Rahul VU3WJM

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Monday, July 25, 2011

Re: [HamBrewers] Pls Help 16F628/628A

 

Some usb-serial dongles have an integrated voltage converter and
output +/- 12 V on the lines. They also implement all the control
lines available on the nine pin connector. These work.

Some dongles dispense with this complexity and just provide 0-5 V.

The "Prolific" brand is said to work.

As for opening up the computer and fitting the header ... Opening up
works, it is the "putting it back together in working order" that is
the problem.

If you have a laptop/netbook with at least one free usb port and a
dongle this could be used for general use with your micro based boards
- just provide a serial in/out port in your project and you have a
full keyboard and display which costs nothing extra.

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RE: [HamBrewers] Pls Help 16F628/628A [1 Attachment]

 
[Attachment(s) from Rajesh K included below]

Dear Dev,

 

I have experimented with 16F628 and home brewed pic programmers. I will go with OM S Chandra Sekhar. It is easy to homebrew a serial port programmer.

 

I have attached a rar file herewith – content this is my entire “PIC programmer folder”. I have homebrewed this one successfully and is working with 628, 876, F84 and many other PICs.

 

Modern PC’s have dispensed with Serial Port as well as Parallel port. In my experience, the USB to Serial port don’t work well at all in many cases. However, you can find “hidden” serial port in many modern PC mother boards. It is usually called “serial port header”. You can connect a “serial port header to 9 pin or 25 pin converter” cable and still do all the good things. I have attached a pic of one such adapter. You can home brew this one also!

IMAGE_161.jpg

73’s

Raj.

VU3RGK (www.qrz.com)

 

 

From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com] On Behalf Of S Chandra Sekhar, PWD
Sent: Monday, July 25, 2011 3:26 PM
To: HamBrewers@yahoogroups.com
Subject: Re: [HamBrewers] Pls Help 16F628/628A

 

 

One solution would be to use a usb - to - serial converter and then
wire up a serial port based PIC programmer.

If you want the direct USB programmer it might be simpler to buy from Microchip.

On 7/25/11, Dev Ramaprabhu <vu2dev@yahoo.com> wrote:
> Dear all,
>
>  I would like to migrate to 16F628 from 16F84 due to my Parallel port pc
> givingup finally!
>
>  My new/old  pc/ laptop  doesnot have any ports other than USB.
>
>  So, dear hambrewers the time has come to make a programmer off the USB
> port. So, if any of you are using a usb programmer for the above generic
> chips please help. I repeat if you are using a usb programmer only please
> reply! Without using the above mentioned programmer please do not reply and
> clutter the group!
>
>  The best regards,
>
>  dev
>
>
> From: Raj vu2zap@gmail.com
>
>       Perfect one for us!
>
>
>

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Attachment(s) from Rajesh K

1 of 1 File(s)

PicProg.rar
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Posted by at No comments:

Re: [HamBrewers] Pls Help 16F628/628A

 

One solution would be to use a usb - to - serial converter and then
wire up a serial port based PIC programmer.

If you want the direct USB programmer it might be simpler to buy from Microchip.

On 7/25/11, Dev Ramaprabhu <vu2dev@yahoo.com> wrote:
> Dear all,
>
>  I would like to migrate to 16F628 from 16F84 due to my Parallel port pc
> givingup finally!
>
>  My new/old  pc/ laptop  doesnot have any ports other than USB.
>
>  So, dear hambrewers the time has come to make a programmer off the USB
> port. So, if any of you are using a usb programmer for the above generic
> chips please help. I repeat if you are using a usb programmer only please
> reply! Without using the above mentioned programmer please do not reply and
> clutter the group!
>
>  The best regards,
>
>  dev
>
>
> From: Raj vu2zap@gmail.com
>
>       Perfect one for us!
>
>
>

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Re: [HamBrewers] Pls Help 16F628/628A

 

Dear all,
 
 I would like to migrate to 16F628 from 16F84 due to my Parallel port pc givingup finally!
 
 My new/old  pc/ laptop  doesnot have any ports other than USB.
 
 So, dear hambrewers the time has come to make a programmer off the USB port. So, if any of you are using a usb programmer for the above generic chips please help. I repeat if you are using a usb programmer only please reply! Without using the above mentioned programmer please do not reply and clutter the group!
 
 The best regards,
 
 dev


From: Raj vu2zap@gmail.com

      Perfect one for us!


 

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Saturday, July 23, 2011

Re: [HamBrewers] Indestructible RF Transistor

 

Yes used zener protection between SOURCE and DRAIN even on gate.

Yes used resistor in series with capacitor for negative feedback in between the GATE and SOURCE for stablization.

Also used  lowpassfilter/ PI network before gate.

But My experience is real bad using LDMOS which is in Video,
Personal experience, LDMOS cannot be used in SSB or AM, , baising them for linearity results in smoke and shortcircuit. LDMOS is only for FM & CW working.

Better turned to RDMOS.


VU3SXT 73's




On 22 July 2011 18:34, Raj <vu2zap@gmail.com> wrote:
 

Perfect one for us!

An IRF510/511 with a TWISTED & HARD wired resistor between the GATE and SOURCE to make sure it never comes off when over heated till solder melting point.. helps.

A zener type protection between SOURCE and DRAIN will help too..

Anyone tried these?




http://www.youtube.com/watch?v=8ziYqjMQGEQ

73,
San
VU3GFF


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Friday, July 22, 2011

Re: [HamBrewers] Indestructible RF Transistor

 

Perfect one for us!

An IRF510/511 with a TWISTED & HARD wired resistor between the GATE and SOURCE to make sure it never comes off when over heated till solder melting point.. helps.

A zener type protection between SOURCE and DRAIN will help too..

Anyone tried these?


http://www.youtube.com/watch?v=8ziYqjMQGEQ

73,
San
VU3GFF

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[HamBrewers] Indestructible RF Transistor

 
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Sunday, July 17, 2011

[HamBrewers] Choosing the Correct Balun

 
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Monday, July 11, 2011

Re: [HamBrewers] digital dial

 

Take a look at this Ed.

http://www.pongrance.com/

and a Yahoo group for discussion http://groups.yahoo.com/group/N3ZI_kits/

I have built one and it is working well. I plan to use it for a FT101B sometime..

>I would like to build a digital (dial) display for a old swan 350. It does not need to go inside the case. It can have its own case thank you

--
Raj, VU2ZAP
Bangalore, India.

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[HamBrewers] digital dial

 

I would like to build a digital (dial) display for a old swan 350. It does not need to go inside the case. It can have its own case thank you

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Thursday, July 7, 2011

[HamBrewers] SMPS isolating

 
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Wednesday, July 6, 2011

Re: [HamBrewers] Re: Amateur Vertical Antenna Calculator

 

Try out this calculator it is very useful for the shack!

http://www.miscel.dk/MiscEl/miscel.html


I really like the java calculators and I know that there are a few out there.  One that comes to mind is K7MEMs Electronic Notebook @ http://www.k7mem.com
For a stand alone calculator (no internet connection required) I use HamCalc by VE3ERP for many of my antenna projects.  The program has calculators for coils, antennas, matching networks, filters, and much more.  It is a dos program but will run in dosbox under both windows and linux.
Thanks for the great list!  I don't contribute much but I definitely learn from the posts.  73,
Rich KD0BJT

--
Raj, VU2ZAP
Bangalore, India.

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[HamBrewers] Re: Amateur Vertical Antenna Calculator

 

I really like the java calculators and I know that there are a few out there.  One that comes to mind is K7MEMs Electronic Notebook @ http://www.k7mem.com
For a stand alone calculator (no internet connection required) I use HamCalc by VE3ERP for many of my antenna projects.  The program has calculators for coils, antennas, matching networks, filters, and much more.  It is a dos program but will run in dosbox under both windows and linux.
Thanks for the great list!  I don't contribute much but I definitely learn from the posts.  73,
Rich KD0BJT

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Tuesday, July 5, 2011

RE: [HamBrewers] Re: Amateur Vertical Antenna Calculator

 

The calculator works, I just have no way of scrolling the entire picture to see all of the text unless I switch to rendering in IE from firefox 5

 

 

From: Raj [mailto:vu2zap@gmail.com]
Sent: 05 July 2011 09:27
To: HamBrewers@yahoogroups.com
Subject: Re: [HamBrewers] Re: Amateur Vertical Antenna Calculator

 

 

Works fine on Firefox 5 with Java enabled.

> Interesting, although the page doesn't load correctly in firefox, it only
>works properly in internet explorer
>
>George
>G0jkz

--
Raj, VU2ZAP
Bangalore, India.

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