[RDXA] Operating question of the day

[w3oab at aol.com]

I find it is my moral obligation to belabor this subject even further. In the "classic" filter type SSB transceiver, the TX mode uses the ~3kHz RX filter to slice the appropriate sideband from the output of the double balanced modulator. In order to accomplish this, a portion of the IF chain is switched between RX and TX duty. In the 897 IF, the filters (CW, SSB, and AM) are PIN diode switched for the appropriate mode. If some sort of failure scenario allowed the 6kHZ AM filter to be switched in (assuming this filter passband is centered at the LO freq.), then both sidebands would be present at TX. Since the radio is CPU controlled, there could be a bunch of I/O involved. If the failure was present at RX as well, then the radio might be able to RX both sidebands while in SSB mode. 

73 de John

 

 

 

-----Original Message-----
From: Doug Stewart <doug.stewart at STCMEMS.com>
To: Edward Gable <EGABLE at Rochester.rr.com>; RDXA reflector <rdxa at rdxa.com>; brenthungate <brenthungate at yahoo.com>
Sent: Sun, Oct 20, 2013 5:46 pm
Subject: Re: [RDXA] Operating question of the day



Brent,
Read this once on a 27mc forum...
Sounds like your IF can ferrites are loose.  Take the cover off the rig and 
tighten all the tuning slugs you find in the radio. (clockwise, definitely NOT 
counterclockwise)  That should take care of it.

73z,
Doug
(that guy on 40 with the southern drawl said it sounded like you just needed 
some adjustments, this would be what he meant)

please don't do this.... :)

!!!!

________________________________________
From: RDXA [rdxa-bounces at rdxa.com] On Behalf Of Edward Gable 
[EGABLE at Rochester.rr.com]
Sent: Sunday, October 20, 2013 2:16 PM
To: RDXA reflector; brenthungate at yahoo.com
Subject: Re: [RDXA] Operating question of the day

Hi Brent:  I, too, heard your USB signal in 40 meters.  Your USB and LSB were 
pretty equal in strength.  I answered your USB CQ, me on USB, to say you were on 
the wrong sideband, but then someone answered you on LSB.  Then I discovered you 
were sending DSB.  It would be interesting to know if you can run OK on 20 
meters where you want USB.  Same on other lower bands.... are they all DSB ?  
/Ed


----- Original Message -----
From: brenthungate at yahoo.com<mailto:brenthungate at yahoo.com>
To: RDXA reflector<mailto:rdxa at rdxa.com>
Sent: Sunday, October 20, 2013 1:11 PM
Subject: [RDXA] Operating question of the day

Hi gang,
    Several times yesterday I was told I was transmitting on LSB and usb at the 
same time. I was operating on 40 LSB and a VE station recorded me on 40 usb and 
played it back to me and it sounded awesome lol.  I was told I was 5 kHz low and 
3 kHz high. Looking for ideas as to why I would be transmitting on both? Only 
idea I have is, the data port on my FT 897d no longer works. So to be able to 
send wave files from N1MM I have to come out of the computer via the speaker 
port into my interface and then into a Y connector on my head set. I'm wondering 
if the speaker volume on computer being set to high would have anything to do 
with this? Other than that I am @ a loss. Any input would be greatly 
appreciated.

73
Brent


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