Mark, can you run the 15M filter through EMRFD's GPLA or LT Spice? I hope I
have specced the filter correctly. But I'd appreciate an independent
confirmation. It is supposed to be an elliptical filter.
- f
Sent from BlackBerry® on Airtel
-----Original Message-----
From: Mark G0MGX <mark.g0mgx@xxxxxxxxx>
Sender: minima-bounce@xxxxxxxxxxxxx
Date: Sat, 18 Jan 2014 11:43:45
To: <minima@xxxxxxxxxxxxx>
Reply-To: minima@xxxxxxxxxxxxx
Subject: [minima] Re: Low Pass filter info?
All,
I've published the sweeps and construction info on my blog - the 15Mhz
filter probably needs a revisit - perhaps missed a turn somewhere? Feel
free to copy whatever anyone needs, I'll also upload elsewhere to a Wiki
once available:
http://g0mgx.blogspot.co.uk/2014/01/minima-song-by-muppets.html
If there are any specific tests anyone wants doing let me know.
Sorry about the blog title - it just that Minima reminded me of the
muppets song Mana-Mana:
http://www.youtube.com/watch?v=8N_tupPBtWQ
Mark
G0MGX
On 18/01/2014 11:33, farhanbox@xxxxxxxxx wrote:
Amazing mark! That's pretty fast work! Let me setup a wiki asap for you to
share the sweeps. I have quite a few sweeps too. But I want someone to perform
IIP3 measurements to but figure to the performance.
- F
Sent from BlackBerry® on Airtel
-----Original Message-----
From: Mark G0MGX <mark.g0mgx@xxxxxxxxx>
Sender: minima-bounce@xxxxxxxxxxxxx
Date: Sat, 18 Jan 2014 11:24:14
To: <minima@xxxxxxxxxxxxx>
Reply-To: minima@xxxxxxxxxxxxx
Subject: [minima] Re: Low Pass filter info?
Hi All
Rummaging in my shack this morning and I have found all the components
needed for the Minima - no purchase necessary - so I just have to build one!
I've just finished and tested my LPF(s) this morning; here is what I used:
0.33u 10 turns T37-6
0.39u 11 turns T37-6
0.66u 12 turns T50-2
0.78u 13 turns T50-2
Then for the 3u in the traps I have used 25 turns T68-6
I will post a link soon to some pics and sweeps of the filters and traps
later this morning.
Mark
G0MGX
On 18/01/2014 11:13, Steve VK2SJA wrote:
Hi Farhan/Group,
Burning the midnight oil in Oz reading everything I can about Minima. Too
hot to sleep anyway. Nearly 10:00pm local and still 27 degrees C. Yuck!
Farhan, congratulations. I can understand just about all of the circuit.
So you have obviously succeeded in keeping things very simple!!
Question about the two low pass filters. I can't see any core or winding
info. Am I missing sonething? I do know just enough to be dangerous and
can craft my own. But I'm lazy and interested in the version pictured on
your web site. The cores in the 15 to 30 LPF look like T68 cores, Yes? But
what are the cores used in the 0-15 LPF??
I came very late to the BitX scene. So this info may be known to long term
Bitxers. I know about the use of nylon tap washers in the original BitX
but these don't look like those? But the cores to me look clear and
plastic like. I've not seen anything like.
Winding data be great too (very lazy).
73, Steve.
VK2SJA
