What was the signal strength that your test receiver was getting on USB? If it was say +30 over S-9 then when you switch the test receiver to LSB that strength may just be "0" if the transmit rejection is calibrated properly. To test this just adjust one of the sliders way up or down and see if the signal appears. If it does just null it back out. Frank ----- Original Message ----- From: Jerry To: FlexRadio@flex-radio.biz Sent: Thursday, January 25, 2007 5:14 PM Subject: Re: [Flexradio] New File Download Capabilities added to the Web Page
Hi John Followed your instructions! Heard a tone regardless if "Enable TX Image etc," was pressed or not. It was about 2 kHz below the marked (14.200) frequency. Note: no power is indicated in the external power meter ( I get .33 watts when hitting the "TUN" button). Switching to LSB (14.200). Nothing is heard or seen on the S meter. Tuning to 2KHZ down, it is S9+10. Again no change with "EnTxImTo" in or out! Also no change when exercising the Amplitude and Phase controls. Tried using the "TUN". Looked for the signal on LSB, virtually NADA ditto 22kHZ below. When using the MOX the panadapter shows the typical (for me) pedestal determined by my xmit pass band selection. No change in the display when pressing or releasing the "Enable TX Image" control. Looks like, based on this and the external receiver reaction, is that no signal is being produced. Where should the image appear when using the "TUN" control? Working condx: RunningXP at 1.4 GigHz & PowerSDR SVN838. Sound card D-44 with SDR1K with PA. Signal taken from the PA output to a Tribander. External Rcvr is: Yeasu MK-V with 5kHz roofing filter looking into a dummy load. Help!! de Jerry At 02:06 PM 1/25/2007 -0600, you wrote: >Jerry, here's how you can do an transmit image calibration if you have >another receiver > >Set your transmitter to 14200 in USB > >Go to Transmit Rejection panel > >Activate Enable TX Image tone > >Set Drive power to 1 > >Click MOX -you should hear a tone in your second receiver > >Place second receiver in FAST AGC mode > >Note the signal strength of signal on the S-meter > >Switch your second receiver to LSB > >Note the signal strength > >Move the Phase and Gain sliders very slowly until you find the point where >the signal decreases. Do this several times alternating between Phase and >Gain. > >Once you get the lowest signal with the sliders, do the same with the >up/down buttons to get even better suppression. > >You should get 30dB or more of rejection. > >Good luck. > >John P. Basilotto >W5GI >Marketing and Product Manager >FlexRadio Systems >Office 512-535-5266 >Mobile 512-608-6727 > > > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Jerry >Sent: Thursday, January 25, 2007 1:12 PM >To: FlexRadio@flex-radio.biz >Subject: Re: [Flexradio] New File Download Capabilities added to the Web >Page > >Hi All > > Well I still cant find out "How to adjust the transmit image >rejection". >Read the manual, scanned above and below the "TUN" frequency etc. I can >hear lots of birdies but none change amplitude with the image rejection >sliders. > > The manual is unclear as to where to listen for the image produced >by >PowerSDR and the SDR-1000. Been scratching my head for months with this >subject. I run power during RTTY contests and worry that my image is QRMing >stations, or worse they are trying to answer my image and not me! > > So, since I can not find the answer in the documentation, where is >the >image (Frequency) when I am in the Digl/CW low mode? Second what happens >when one "Enables TX Image Tone"? Should one use the LSB/USB mode. If so >is the signal path different from DIGL or CW thus requiring different >adjustment? > > yours in confusion Jerry NO2T > > >_______________________________________________ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >FlexRadio Homepage: http://www.flex-radio.com/ > >FlexRadio Knowledge Base: http://kb.flex-radio.com/ > > > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.5.432 / Virus Database: 268.17.1/640 - Release Date: 1/19/2007 4:46 PM > > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.10/651 - Release Date: 1/24/2007 6:48 PM -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070125/e9d615a5/attachment.html _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
