[minima] Re: Mixers and Crystal Filters
- From: Mark G0MGX <mark.g0mgx@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Sun, 19 Jan 2014 15:15:30 +0000
All,
I've added another example with a 7MHz signal to the RF port and 27MHz
to the LO port and updated this page appropriately:
http://g0mgx.blogspot.co.uk/2014/01/yet-more-minima.html
I also experimented with the 15MHz low pass filter and made another
using T50-6s (13 turns for 0.66u and 14 turns for 0.78u) and the sweep
looks almost identical to the previous one using T50-2s so I will have
to come back to that filter again as I suspect I have too much
attenuation at 14MHz. We will see!
I have just made the BFO and uploaded some info here:
http://g0mgx.blogspot.co.uk/2014/01/minima-bfo.html
Mark
G0MGX
On 19/01/2014 08:23, Ashhar Farhan wrote:
mark,
the local oscillator has to be at 27 mhz. on the higher side. this
will reduce the local oscillator leakage to the RF port (you can see
that the oscillator suppression isn't any great shakes. It is about
-40dbm. That will be only 20 db below the tx signal level unless the
LPF kicks in.
- f
On Sun, Jan 19, 2014 at 1:02 PM, Mark G0MGX <mark.g0mgx@xxxxxxxxx
<mailto:mark.g0mgx@xxxxxxxxx>> wrote:
Hi Team
Some more musings of mine on the mixer output, crystal matching
and selection plus a sweep of my crystal filter...
http://g0mgx.blogspot.co.uk/2014/01/yet-more-minima.html
Mark
G0MGX
Other related posts:
