[minima] Re: Working yo4hhp PCB
- From: Mvs Sarma <mvssarma@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Thu, 6 Feb 2014 16:46:59 +0530
Thanks Alan,
and congrats.
I had been off for few days
and now as I returned and your message flashed.
happy to see the nice board and your effort for the decent looking working
board !
On Thu, Feb 6, 2014 at 4:41 PM, Alan <alan@xxxxxxxxxxxx> wrote:
> Hi All
>
> Just thought the list may be interested in knowing that the original
> PCB design by Adrian yo4hhp, for the main board all works fine on receive,
> not fully tested on TX, but does transmit OK. I've no high end test gear
> apart from a frequency counter, so you don't need a lot to get it working.
>
> A couple of small changes:
>
> 1) Inductor for BFO in series with 20 Mhz crystal, moved in series with
> just one variable capacitor, and inductor linked out. This was due to
> crystal not having enough movement for both USB & LSB.
>
> 2) Resistor in emitter of Q10 changed from 100 to 1K, otherwise Q10
> overheats, possibly higher gain Q9/Q10 than in other builds, appears to
> have more than enough injection with 1K.
>
> I've attached a jpg, please note that this has been built with junk box
> bits apart from relays, & crystals so some components may not be the size
> intended :)
>
> Presently being controlled by PC using a Si570 via USB, and manual
> switches for LSB/USB, LPF. Receive audio very clear and tested on 3.5Mhz to
> 21Mhz, probably will need some screening around oscillator/IF Crystals.
>
> Next the controller.
>
> Cheers
>
> Alan VK2TVQ
>
>
>
--
Regards
Sarma
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