For the linear transponder Satellites I have found with my IC 820H using the main tuning dial to adjust receive and switching that side and adjust for transmit works the best during Field Day operations. The I-Com is just to clumsy to use the sub receiver, RIT does not have enough range, no easy way to adjust the offset, transmit power, ETC. I calculate the offset VS time using Instant Track in advance and work off of paper data. I set the elevation of the mast to match the pass and a single rotator performs both elevation and azimuth functions.
If we had a HEO I would consider buying something better than the 820, but for now I drag out the old 820 and make a few contacts for W6NWG each year at FD, and that is the extent of my satellite activity.
Art, KC6UQH
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of James Duffey Sent: Saturday, April 18, 2009 7:18 PM To: Jerry Felts Cc: Amsat BB Subject: [amsat-bb] Re: Tuning
Before the advent of computer Doppler tuning compensation, the convention was to tune the radio on the highest band as that is where the doppler is the largest and to leave the other one alone as much as possible. That is not a perfect solution as different stations in the footprint see different Doppler shifts and it is usually unavoidable to tweak both radios. But you can generally save yourself a lot of confusion by only tuning one radio, the highest one, whether it be receive or transmit.
If you are using a computer for tracking, it should also give you the doppler correction even if you are not controlling the radios with it and you should find your downlink without too much trouble. It is confusing at first, but after a while you get hte hang of it and it becomes second nature.
If you can catch AO-7 in Mode A, that is a good mode to practice Doppler compensation with as the doppler shifts are much lower. - Duffey
On Apr 18, 2009, at 12:07 PM, Jerry Felts wrote:
I have made 2 contacts now both were VO-52. Both times on SSB and very confusing. So say I'm working you. I found a clear freq by sending alot dots. The uplink tx is switched to LSB. Do I leave the tuning dial on the uplink rig and just use the tuning dial on the downlink to do my tuning? Or do I juggle both rigs tuning dial and get confused?
Jerry - NR5A - South Dakota www.freewebs.com/nr5a http://groups.yahoo.com/group/Minimalist_QRP_Transceivers/ http://www.cakewalkblogs.com/nr5asminimalradio/index.aspx http://nr5abeaconblog.blogspot.com/ _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
-- KK6MC James Duffey Cedar Crest NM
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