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
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
... 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.
AOS 1824 UTC Sep 28 (JN49lr) very low pass
LOS 1830 UTC
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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
Thanks in advance.
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:…
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
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
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.