[minima] Re: band switching
- From: "pakdeDar" <pakdedarmantaoye@xxxxxxxxx>
- To: "Minima Group" <minima@xxxxxxxxxxxxx>
- Date: Sun, 9 Feb 2014 12:18:31 +0000
Hi Sandeep Sir,
You use simple manually rotary switch, you even do not use relay on
input/output.
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 ?
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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