September 2006 - AMSAT-BB - mailman.amsat.org

Re: UHF pwr amp
by Matt 29 Sep '06

29 Sep '06

Hi Pop. Have a look at VK5EME's website at http://www.minikits.com.au/ >I wish to build a UHF pwr amp using the Mitsubishi M57729 to carry along for >portable operation with my little Uhf handy (0.5 watt ). >Appreciate help with regard to application notes and ready PCB design notes >guidance etc.

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Sinclair Radio Labs A-2C08D
by G. Beat 28 Sep '06

28 Sep '06

This orphan RF pre-amplifier (Model A-2C08D) landed on my door step. It is a VHF (132 - 174 MHz) pre-amplifier that Sinclair Radio Labs (Tonawanda, NY) marketed in the 1970s. Its a Manhattan style construction in a nice Pomona box :-) Of course, this orphan does not work. Chance that anyone may have a schematic? ... likely a 4-pin FET ... before I open it up on the workbench next week? Initial e-mail to current Sinclair went un-answered. Phone call likely next, but I doubt they have the schematic for this old pre-amp on-file. Greg w9gb

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Re: Arrow Antennas
by Fred A Parker 28 Sep '06

28 Sep '06

Sorry the name is the Northlander. After my QTH up here in the cold and soon snow of northern Minnesota Burghardt should have them in there web store soon. Fred

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HITSAT 1824 UTC
by Mike Rupprecht 28 Sep '06

28 Sep '06

AOS 1824 UTC Sep 28 (JN49lr) very low pass Hit3 0e4c4e4.4d4b4749 Hit4 c1d5d1e1 Hit1 jr8yjt Hit2 92903250229 Hit3 2a4... LOS 1830 UTC 73, Mike DK3WN _______________________________________________ Sent via AMSAT-BB(a)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

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UHF pwr amp
by Prathap Kumar 28 Sep '06

28 Sep '06

Hi All I wish to build a UHF pwr amp using the Mitsubishi M57729 to carry along for portable operation with my little Uhf handy (0.5 watt ). Appreciate help with regard to application notes and ready PCB design notes guidance etc. Thanks in advance. Best 73 Pop VU2POP

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Re: Arrow Antennas
by Fred A Parker 28 Sep '06

28 Sep '06

I will be shipping in a few days ten antennas designed for portable LEO satellite work to Burghardt Ameteur Center. They are a LPDA simular to the Elk but with the eliments angled at thirty degrees to help the gain by about 3db. They are a true Dual bander VHF/UHF with single feed. They have been an on going project. Lou Mc Faddin W5DID has been my Elmer for them. Amsat may carry them in there store in the future. I have sold about ten of them locally and on Ebay to get feedback and have not yet received any negative comments on there perfomance. Her is a link for a better discription and pictures of one I sold on Ebay. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=ADME:L:EOISSAA:US:… Fred KF0AK

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Re: 70cm preamp
by Alan P. Biddle 28 Sep '06

28 Sep '06

Bill, I can't help but wonder if the unit has mislabeled leads. Of course that is preposterous, but you can't argue with success. Hi Hi! Glad you got things working! Alan WA4SCA

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YES !! RS-15 is alive !
by lu7abf 28 Sep '06

28 Sep '06

Hello Domenico, et all aboard BB Thanks for test and try. Perhaps there is some timer or condition that place/unplace operational the RS-15 transponder, or variable attitude hence antenna position. What I noticed, is that on-off period of beacon is variable, sometimes the cycle is about 1 second on, 7 sec off, under that situation I was not receiving the transponder. The time where I succeed getting back my uplink was when beacon was 10 seconds on and 2 seconds off. Perhaps it varies according to pannels solar exposure. When transponder operating, my CW replicates the same woeing that the beacon has, it means has some fming. Also it is possible that command station still has control over RS-15, and can set on or off transponder, or some external event is doing alike effect. That's reason I copied to control station email stated on RS-15 page. So, I will keep trying and perhaps we could infere some pattern about transponder operation. 73, lu7abf, Pedro lu7abf(a)amsat.org.ar www.amsat.org.ar

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HITSAT 1648 UTC
by Mike Rupprecht 28 Sep '06

28 Sep '06

AOS 1648 UTC Sep 28 (JN49lr) Hit1 jr8yjt Hit2 92901462633 Hit3 0d4c504b4d494848 Hit4 c1d6d1e2 Hit1 jr8yjt Hit2 92901502326 Hit3 284b4f4b4d49474b Hit4 c1d5d1e2 Hit1 jr8yjt Hit2 92901..2..5 LOS 1657 UTC 73, Mike DK3WN

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Hitsat auto doppler tuning
by Bruce Robertson 28 Sep '06

28 Sep '06

Gang: I thought I'd point out that the keps listed as 'TLE used at ground station in HIT(Hokkaido Institute of Teachnology)' on the page http://www.hit.ac.jp/%7Esatori/hitsat/hit-sat_tle.txt worked perfectly for me last night. Using the specified frequency of 437.275MHz I could hear the bird from rise to setting using doppler tuning software and not a jot of manual tweaking. Computer-aided tuning is particulary useful on Hitsat due to the long delay between telemetry lines. Enjoy! 73, VE9QRP Bruce

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