Bill, If you are asking for us to allow CW SWR measurements with the tuner, then this should go on the software feature request list on the support site. If you are unable to tune a 2.4 SWR, then you either have a bad unit or the reactance is at a quirky value. Try adding a few feet of coax and see if that changes the tuning. You should be able to tune up to 10:1 but reactance can play a factor. Gerald
Gerald Youngblood, K5SDR FlexRadio Systems 8900 Marybank Drive Austin, TX 78750 Ph: 512-535-5266 Email: [EMAIL PROTECTED] Web: www.flex-radio.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of William Bordy > Sent: Monday, March 13, 2006 11:24 PM > To: 'Robert McGwier' > Cc: [email protected] > Subject: Re: [Flexradio] SDR-ATU will not match bypass SWRs > in 2.0 to 3.0range enough to allow full power output. > > > > Bob, > > You are correct in your remark in regards to SSB operation, > but I am doing my SWR measurements with a constant CW signal. > I thought I made that clear in my original post. > > Original post: > >If I do a full tune at 14.349 MHz, the tune cycle completes, but the > >calculated SWR with a CW carrier using the Fwd Power (27W) and Rev > >Power > >(5W) reading of the PowerSDR console shows no SWR (2.5) improvement > >over the Bypass tune selection. > > My suggestion of an SWR calculation would only be correct for > a CW transmission (special tune cycle perhaps), but would > still be useful to eliminate the need to perform calculations > externally to understand the SWR into the tuner. Regardless, > it is the only method available to determine the SWR into the > SDR-ATU at the moment. > > I expected to be able to run the full 100 watts into an > antenna with a SWR of 2.4 using the SDR-ATU to correct the > mismatch. Is this expectation incorrect? > > 73, > Bill > NJ1H > > -----Original Message----- > From: Robert McGwier [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 14, 2006 12:07 AM > To: William Bordy > Cc: [email protected] > Subject: Re: [Flexradio] SDR-ATU will not match bypass SWRs > in 2.0 to 3.0 range enough to allow full power output. > > William Bordy wrote: > > I posted the following as a bug report at > <http://support.flex-radio.com/> > > http://support.flex-radio.com/ . It was subsequently classified by > FlexRadio > > as "not a software bug". I did not realize that the support bug > > reports > were > > only for software. Regardless, the response provided seems > off target. > > > > > > > > I am now posting this to the reflector, as I continue to be > > frustration by the ATU performance. I initially thought > that perhaps > > my problems would > get > > ironed out as the software matured. There has been significant > > improvement in the tune cycle operation, but I have not had any > > improvement in the operation of the radio due to the ATU. > Based on my > > experience as described below, the ATU is of no benefit for > my setup. > > > > > > > > As I explained in my submittal, the external SWR measurements were > > with > the > > ATU in bypass mode. In addition, the antenna SWR measurements have > > been confirmed with another transmitter without an ATU in line. In > > addition, > all > > SWR measurements with the SDR-ATU inline were calculated > using the the > > PowerSDR Console "Fwd Power" and "Rev Power" measurements. > As I have > > mentioned in previous email to the reflector, I don't > understand why > > an > SWR > > reading cannot be auto calculated rather than doing the > calculations > > externally. I understand the two reading cannot be done > concurrently, > > but you can do a FWR then REV reading and do the math. > > > > > > This supposition, which is part of your aggravation is > wrong. SWR is > calculated from the ratio or powers or voltages using > SIMULTANEOUS readings. With modes such as SSB, the > instaneous voltage can change drastically between the forward > and reverse direction reading, rendering a ratio absolutely > meaningless. It would be worse than useless since it > would give you false information. I have owned various LDG > tuners for > many years. They perform beautifully. This one, like the > others, does its job independently of the what is going on > in the PowerSDR unless a) there is a hardware problem in your > ATU or b) there is a bug in the software. The PowerSDR is > not involved in the actual tuning other than to say "go". > > I have not yet plugged mine in to my unit since I have big > tuners and twin lead running to the antennas except for my > Steppir vertical and beam and for those I don't need a tuner anywhere. > > Good luck, > Bob > N4HY > > > > > > > If others are getting real value from the SDR-ATU, please > let the rest > > of > us > > know and explain the benefit you are getting. > > > > > > > > 73, > > > > Bill > > > > NJ1H > > > > > > > > O > > -- > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman > Laziness is the number one inspiration for ingenuity. Guilty > as charged! > > > > > _______________________________________________ > FlexRadio mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: > http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ > FlexRadio Homepage: http://www.flex-radio.com >
