Your unit shipped 7/21, so you should be good to go. Eric
-----Original Message----- From: Ryk Houseman [mailto:[EMAIL PROTECTED] Sent: Thursday, September 01, 2005 3:57 PM To: [EMAIL PROTECTED]; Eric; 'Gerald Youngblood'; 'MailFlexRadio' Subject: Re: [Flexradio] 100W PA Bias Adjustment ECO Eric and Gerald: Could you please confirm that my black box has the proper bias adjustment? Thanks, Ryk N6DQ --- [EMAIL PROTECTED] wrote: > Eric and Gerald: > > I haven't done this ECO mod yet, but expect that I > need it from audio reports I've received. When > measuring total current (DC) drain before actually > doing anything, I found it to be 1.98 amps. Since > this is significantly higher than the 1.5 amps > mentioned in the ECO, I thought I better check with > you on whether or not this is a problem. What do > you suggest? (You may not recall, but I was the guy > who had an oscillating 100PA until I went in and > resoldered several things. After that, it seems to > work fine - minus some distortion on SSB. PSK is > very clean.) Any idea what qiescent current draw > should be? > > Gary AI4IN > -------------- Original message > ---------------------- > From: "Eric" <[EMAIL PROTECTED]> > > FYI: The ECO document has been updated to clarify > several things in the > > documentation. The newer document is available on > the private download > > site. > > > > > > Eric Wachsmann > > FlexRadio Systems > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On > Behalf Of Gerald Youngblood > > Sent: Tuesday, August 30, 2005 2:21 PM > > To: MailFlexRadio > > Subject: [Flexradio] 100W PA Bias Adjustment ECO > > > > Dear FlexRadio customers, > > > > The SDR-100WPA, 100 Watt amplifier module is > included in all SDR-ASM/TRA > > 100 > > Watt model radios and is offered as an upgrade > option for existing > > SDR-ASM/TR 1 Watt models. The amplifier uses a > push-pull pair of IRF510 > > FETs in the driver stage followed by a push-pull > pair of 2SC2879 bipolar > > transistors in the final stage. > > > > 100W radios and amplifier modules shipped before > July 15, 2005, had the > > FET > > bias set to either 30mA or 50mA per transistor. > Recent experiments have > > shown that IMD distortion at the lower bias levels > may result in a low > > level > > of distortion on SSB transmissions which may or > may not be audible on > > the > > air. Before and after recordings demonstrate that > this distortion is no > > longer audible when the FET bias is set to 100mA > per transistor. IMD > > products as displayed on a spectrum analyzer are > reduced as well. > > > > We have posted a completely optional bias > adjustment procedure (ECO-027) > > on > > the private customer download site that can be > used to modify these > > settings. Radios shipped on or after July 15, > 2005 include the 100mA > > bias > > settings. > > > > 73, > > Gerald > > K5SDR > > FlexRadio Systems > > > > > > _______________________________________________ > > FlexRadio mailing list > > FlexRadio@flex-radio.biz > > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > > > > > > > _______________________________________________ > > FlexRadio mailing list > > FlexRadio@flex-radio.biz > > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >
