Message	Date	From	Subject
5270	2010-09-28 05:59:13	Chris Trask	Re: [emrfd] Question Regarding The X-Môde Diode Mixer
> > Chris, thank you for an interesting paper. > > Looking at your schematic on page 5 it is obvious how the RF input and IF output > connections can be floated from ground and used as balanced connections. If > feeding the LO Input port with a balanced input would it be correct to wire one > connection to the center and the other to both 'outside' connections (in parallel > but anti-phase)? > > I ask this because I want to feed the mixer with the Q and notQ outputs of a > flipflop to ensure a 50-50 mark space ratio. HSMS-2802 devices will be used. > Good question since many LO sources have a bi-phase output as you've described. To accomodate that, you first disconnect the common input connection between the primary windings of T1 and T2. Next, reverse the ground and signal connections of one of those primaries. The two primrary connections are now 180º out of phase with a common ground connection, as you require. Chris Trask N7ZWY / WDX3HLB Senior Member IEEE http://www.home.earthlink.net/~christrask/
5271	2010-09-28 06:19:56	Chris Trask	Re: [emrfd] Question Regarding The X-Môde Diode Mixer
> > Chris, thank you for an interesting paper. > > Looking at your schematic on page 5 it is obvious how the RF input and IF output > connections can be floated from ground and used as balanced connections. If > feeding the LO Input port with a balanced input would it be correct to wire one > connection to the center and the other to both 'outside' connections (in parallel > but anti-phase)? > > I ask this because I want to feed the mixer with the Q and notQ outputs of a > flipflop to ensure a 50-50 mark space ratio. HSMS-2802 devices will be used. > Didn't understand what you were saying until just now. Yes, you can disconnect the LO input primary windings from ground and connect your biphase LO signal across them. Chris Trask N7ZWY / WDX3HLB Senior Member IEEE http://www.home.earthlink.net/~christrask/

Message

Date

From

Subject

5270

2010-09-28 05:59:13

Chris Trask

Re: [emrfd] Question Regarding The X-Môde Diode Mixer

>
> Chris, thank you for an interesting paper.
>
> Looking at your schematic on page 5 it is obvious how the RF input and IF

output

> connections can be floated from ground and used as balanced connections.

> feeding the LO Input port with a balanced input would it be correct to

wire one

> connection to the center and the other to both 'outside' connections (in

parallel

> but anti-phase)?
>
> I ask this because I want to feed the mixer with the Q and notQ outputs of

> flipflop to ensure a 50-50 mark space ratio. HSMS-2802 devices will be

used.

>

Good question since many LO sources have a bi-phase output as you've
described.

To accomodate that, you first disconnect the common input connection
between the primary windings of T1 and T2. Next, reverse the ground and
signal connections of one of those primaries. The two primrary connections
are now 180º out of phase with a common ground connection, as you require.

Chris Trask
N7ZWY / WDX3HLB
Senior Member IEEE
http://www.home.earthlink.net/~christrask/

5271

2010-09-28 06:19:56