[MAMS] 902 activity

[Zack Widup]

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
>