Hello again John, Looking at the schematic, any difference you see should be so slight that you'd not make comment on it. If it were me I'd take a look at the inductors LD-LG (on page 4 of the schematic) to see if there is the possibility of one of them being shorted. I haven't had look at these but it's common to twist the terminating wires together - a likely spot for a short.
I'd stick the CRO on the output of each of the 4 inductors (where the circuit shows "RX_I" and "RX_Q" and the opposite side of C1K and C1L) all the levels here should be pretty much identical. Of course you can only expect this over the range of +- 96kHz or so. 73's Peter VK4JD PS - love this little radio, it's an amazing bit of portable kit -----Original Message----- From: John [mailto:[email protected]] Sent: Tuesday, 17 March 2015 1:53 PM To: Peter Lambert; [email protected] Subject: Re: [Elecraft] KX3 IQ Outputs - What to expect? Thanks Peter. I do see the 90 degree phase difference and how it changes if I move above or below the test frequency. However the amplitude of just one, the ring conductor on the connector, decreases with increasing delta frequency. The amplitude of the tip remains steady regardless of the delta frequency. I assume this isn't what I should be seeing. Now I need to figure out me next move as this seems to not be what the PX3 wants. Does anyone know a reason the I and Q might be different amplitudes for the same signal? Thanks. John, kx4o On 3/16/2015 8:38 PM, Peter Lambert wrote: > Hi John, > > In this situation the amplitude of both the I and Q channels should be > the same and they should always be 90 degrees out of phase. > > Peter VK4JD > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
