[minima] Re: band switching
- From: "pakdeDar" <pakdedarmantaoye@xxxxxxxxx>
- To: "Minima Group" <minima@xxxxxxxxxxxxx>
- Date: Sun, 9 Feb 2014 14:50:13 +0000
Isok ae ko-en Sandeep Sir..arek sitok iki nduaagel poll...
Tararengkyu for your nice explanation OM Sandeep from VU land, hello from us in
YB land.
Sudarmanta
Kaspa-kaspaanlayauw ®
-----Original Message-----
From: Sandeep Lohia <sandeeplohia12@xxxxxxxxx>
Sender: minima-bounce@xxxxxxxxxxxxx
Date: Sun, 9 Feb 2014 20:13:40
To: <minima@xxxxxxxxxxxxx>
Reply-To: minima@xxxxxxxxxxxxx
Subject: [minima] Re: band switching
On 09/02/2014, pakdeDar <pakdedarmantaoye@xxxxxxxxx> wrote:
> Hi Sandeep Sir,
> You use simple manually rotary switch, you even do not use relay on
> input/output.
Dear Friend from Indonesia
what ever I know a little mostly learnt form Farhan only, ;)
> Have you some experience to blow up the PA transistor due to forget to
> switch to correct selected band and transmit ? How to avoid such
> possibilities ?
Here I have many Rigs but only 1 coax...
Yes, once I forgot to connect antenna coax to 2SC1971 PA & transmitted
:D it blew up instantely...
to avoid such possibletis one can use ALC (automatic logic control)
but that won't be MINImum' -MA way
& it's my time to play with tubes...
--------------------------------------------------------------------------------------
CHARLIE DELTA -4017 might have originated from & for automated
countries rattling Renesas. Hi
U may also use correct band indicating LED, me not expert in codes nor
even Harvard educated.
Here not living Manhattan, & prefer life simple but being MIL -bullet
proof. (DPMT manual rotary switch)
VK2 saY software think one particular band while the 4017 is on another. He hee
----------------------------------------------------------------------------------------
Again there's a lot potential with Farhan's beauty,
nearly anybody can make component changes and design alterations to
fit their personal needs, and their own parts availability.
> I see many system in the internet to select proper lpf automatically.
> Your picture tell me complete story.
> Nuwun ya mas Sandeep...
> pakdedar
> Kaspa-kaspaanlayauw ®
> -----Original Message-----
> From: Sandeep Lohia <sandeeplohia12@xxxxxxxxx>
> Sender: minima-bounce@xxxxxxxxxxxxx
> Date: Sun, 9 Feb 2014 12:06:09
> To: <minima@xxxxxxxxxxxxx>
> Reply-To: minima@xxxxxxxxxxxxx
> Subject: [minima] Re: band switching
>
> why burn extra energy in relays??? they always ON !
>
> here using something like : (see attachments)
> it's just mine is MIL-RECYCLED, (air-wound properly angled)
> hope pictures say complete story :D
> On 09/02/2014, Ashhar Farhan <farhanbox@xxxxxxxxx> wrote:
>> here's another idea:
>>
>> use a CD4017. the 4017 has upto ten outputs. only one goes high at a
>> time.
>> as you pulse the clock input, the high moves to the next pin.
>> so, what you do is this :
>> 1. Use one pin to reset the CD4017 (the high moves to the pin'0').
>> 2. generate low to high pulses to move the high output to the desired
>> band.
>>
>> as the CD4017 outputs a high, you can use this to drive a 2N7000 to
>> switch
>> the relays. the 2N7000 has built-in diode to prevent the flyback surge.
>>
>> - f
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