[minima] Re: A fully analog Minima
- From: Ashhar Farhan <farhanbox@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Mon, 20 Jan 2014 20:23:55 +0530
Peter,
One could have a VFO swing from 20 MHz to 50 Mhz and probably use a fast
HnP stabilizer.
Here are two:
1. http://www.cumbriadesigns.co.uk/x-lock.htm
2. http://www.hanssummers.com/huffpuff/minimalist/2chipfast.html
- f
On Mon, Jan 20, 2014 at 6:05 PM, <pierre@xxxxxxxxxxxxxx> wrote:
> Farhan,
>
> A fully analog minima with a free running VFO.
>
> I have been thinking of how that might be done given the constraint of
> having
> to keep the VFO frequency reasonably low to minimise drift and sensitivity.
>
>
> Then choice of IF to go with the low LO frequency and then how to keep
> spurious
> mixing products out of the output.
>
> The current high IF frequency helps to move the baddies a long way up the
> spectrum where the LPF filters will have a good reject response.
>
> I guess it will come down to better BPF filters and probably narrow band
> operation.
>
> regards,
>
> Peter VK1XP
>
> PS: have you ever had a look at the architecture of the Atlas (210/215
> series)
> HF transceivers from the 1970's ??
>
> >-- Original Message --
> >Date: Mon, 20 Jan 2014 16:58:28 +0530
> >Subject: [minima] Re: Parts - 20 Mhz Crystals?
> >From: Ashhar Farhan <farhanbox@xxxxxxxxx>
> >To: minima@xxxxxxxxxxxxx
> >Reply-To: minima@xxxxxxxxxxxxx
> >
> >
> >Adrian,
> >
> >I would suggest that you keep it in two parts. Keep the Arduino, the LCD
> >display with Si570 on one pcb. the other pcb can have the main minima
> >circuitry.
> >that way, either of the boards can be reused. I plan to make a fully
> analog
> >minima with a free running VFO soon.
> >
> >- f
> >
> >
> >On Mon, Jan 20, 2014 at 4:37 PM, Adrian Preda <ady.preda@xxxxxxxxx>
> wrote:
> >
> >> Hi all,
> >>
> >> I just ordered this
> >>
> http://www.ebay.com/itm/100pcs-20-000MHZ-20-MHZ-20M-HZ-DIP-Crystal-Oscillator-HC-49S-New-/251251477769?pt=AU_B_I_Electrical_Test_Equipment&hash=item3a7fc14d09
> >>
> >> 100pcs at 5$
> >>
> >> In the meantime I am working on a PCB in Eagle for the Minima. Hope to
> >> finish it this week.
> >>
> >> 73'
> >> Adrian
> >> YO4HHP
> >>
> >>
> >>
> >> On Monday, January 20, 2014 1:03 PM, Ashhar Farhan <
> farhanbox@xxxxxxxxx>
> >> wrote:
> >> I used those marked KDS and MEC. they are the low profile HC-49/U
> >> crystals.
> >>
> >> Just found this (forget reading chinese, just see the price and the
> goods)
> >>
> >>
> http://www.ebay.com.hk/itm/Crystal-HC-49-20-000-Mhz-HC49-20MHz-Crystal-50-pcs-/191031876191?pt=LH_DefaultDomain_0&hash=item2c7a631a5f&_uhb=1
> >>
> >> - f
> >>
> >>
> >> On Mon, Jan 20, 2014 at 4:27 PM, Steve VK2SJA <vk2sja@xxxxxxxxxxx>
> wrote:
> >>
> >> Gents,
> >>
> >> What brand crystals are you guys using/sourcing and how much are they
> >> costing each?
> >>
> >> Anyone see issue with Multicomp ones:-
> >>
> >>
> >>
> http://au.element14.com/multicomp/hc49u-20-20-30-60-00-atf/crystal-hc-49-u-20-0mhz/dp/1666982
> >>
> >> Before I go ahead and order a whole bunch.
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
>
> *Scribed with half a house brick on my Aspirin tablet*
>
>
>
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