[MAMS] 902 activity

[Zack Widup]

Thanks, Jerry. That looks simple enough. I'll try it.

73, Zack W9SZ


On Sun, Jan 29, 2012 at 5:26 PM, Dr. Gerald N. Johnson
<geraldj at weather.net>wrote:

> A simple way to achieve optimum alignment is with a weak signal and the
> receiver on FM. The signal should be so weak there is only partial
> quieting. then tweak the preamp for maximum quieting. That also achieves
> best NF. If you get too much quieting, you can reduce the test signal
> some more. A Simpson or Triplett VOM on the speaker wires on AC is a
> good indicator of quieting. No modulation on the signal, just a carrier.
>
> 73, Jerry, K0CQ
>
> On 1/29/2012 4:49 PM, Zack Widup wrote:
> > Great! I have one of those "Dayton Special" Yagi antennas but it
> > expectedly does not perform as well as my looper on a longer boom.
> >
> > I think I need to tweak my 902 preamp. It's a WD5AGO circuit using the
> > ATF36077 followed by MGA61563. I have heard that, lacking a NF meter,
> > I can tweak it by adjusting for a peak in signal, then just backing
> > off slightly.Not sure which way I should back it off for best NF -
> > above or below the peak. There is only one adjustment on this amp -
> > the inductor in the input circuit. WD5AGO says it's supposed to have a
> > gain on the order of 35 dB and NF of 0.3 dB. I'm working on a similar
> > circuit for 1296 (only the input inductor is different).
> >
> > I got an amp for 2304 that's supposed to put out 25 watts. Haven't
> > fired it up yet; maybe in the next week so I can use it in MAD.
> >
> > 73, Zack W9SZ
> >
> >
> > On 1/29/12, Dave Calvert<kb0pe at yahoo.com>  wrote:
> >> Hello to the group,
> >> After a great time at our WinterFest in Collinsville, IL. this Saturday
> I
> >> ran into Marcel - N9NJY/ EM58bL
> >> and he has worked Zack on 902 for his first contact ever!  Marcel has a
> DEMI
> >> box with 30 watts and he
> >> bought two of the cheap end mounted 902 Mhz yagi's at this past Dayton
> >> hamfest.  He made a power
> >> combiner so that the two yagi's are up around 130 ft. on his tower.  We
> made
> >> a sked for this morning and
> >> we worked each other on 902.100 using USB!  He was 5X5 at my end so we
> tried
> >> 1296 but he
> >> discovered high VSWR on his line plus I didn't hear anything so
> hopefully he
> >> will find the problem and be
> >> ready for the next MAD weekend, this 4 th of FEB.  The two combined
> >> yagi's seem to be performing OK but
> >> the band conditions are way down.....
> >>
> >> I will be getting my ROVER Antenna rack on my Mercury Mountaineer this
> >> weekend and plan to drive up
> >> to EM49ua and see what can be worked next weekend on the uW bands!  2m
> >> Liaison 144.260, 902,
> >> 1296, 3456 and 5.7.  anyone like a sked, let me know.
> >> 73,
> >> Dave
> >> ______________________________________________________________
> >> MAMS mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/mams
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:MAMS at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> > ______________________________________________________________
> > MAMS mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/mams
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:MAMS at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> ______________________________________________________________
> MAMS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mams
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:MAMS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>