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  • Lowest frequency according to datasheet is 10MHz John
    John Mar 15, 2016
  • Bad, no 160m john From: mailto:softrock40@^$1 Sent: Tuesday, March 15, 2016 2:27 AM To: softrock40@^$2 Subject: [softrock40] 80-10M, 5W IQ Transceiver I just posted a photo of our latest prototype: Softrock-40 Interest Group Softrock-40 Interest Group The SoftRock-40 is a small, low-cost, good performing 40-meter "software defined radio" receiver that plugs into a computer USB...
    John Mar 15, 2016
  • Here is the spec on the AUD20101 at http://www.sybausa.com/productInfo.php?iid=1191 Stereo out but mono in ??? John G3UGY
    John Oct 21, 2015
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  • Nick, is one of them a Kyoritsu K-126B ? I have been looking for one. John G3UGY --------------------------------------------------------- I agree, much better than a GDO. In fact I have two GDOs for sale as I type! 73 Nick G3VNC
    John Apr 18, 2015
  • > I have not changed the transformer, so far I can't find a supplier for the core apart from Cecil. > >73 Alan G4ZFQ Alan, If it is a BN61-2402 you are after then Les G4HZJ of AM Tools has them. http://www.amtoolsuk.com/joomla/index.php?page=shop.product_details∏uct_id=96&flypage=flypage.tpl&pop=1&option=com_virtuemart&Itemid=1&vmcchk=1&Itemid=1 John G3UGY
    John Mar 16, 2015
  • Original Message ----- Subject: Re: [softrock40] Re: RXTX Leakage and Transmit Spurs > > Extremely interesting. You are concentrating on transmit spurs but there may be a similar effect on > the QSD lines on the receiver mixer adding to spurs on receive. > John, As the TX problem seems to be caused by highish input levels to the mixer I wonder if this problem is going to affect RX...
    John Mar 10, 2015
  • Phil, Most certainly agree TX spurs greater than regulations are more important. If Warren finds a solution for the transmit spurs possibly the same remedy may be applied to received spurs or may be not. Personally, I find it an irritation to see carrier spikes moving in opposite directions when tuning the band. John From: mailto:softrock40@^$1 Sent: Monday, March 09, 2015 7:21 PM...
    John Mar 9, 2015
  • Warren, Extremely interesting. You are concentrating on transmit spurs but there may be a similar effect on the QSD lines on the receiver mixer adding to spurs on receive. John From: mailto:softrock40@^$1 Sent: Monday, March 09, 2015 2:51 AM To: softrock40@^$2 Subject: [softrock40] Re: RXTX Leakage and Transmit Spurs After a weekend of work I needed to summarize for myself and for...
    John Mar 9, 2015
  • In the top right graph, what are the units for the x and y scale? Thanks, John
    John Jan 23, 2015
  • Warren, Have you measured the transconductance of the Q5 devices which gave the highest and lowest power output in your test? I would say the device with the lower transconductance would result in the higher power output. John
    John Jan 17, 2015