[Moon-net] Fwd: Re: 2.40m dish

Edward Cole kl7uw at acsalaska.net
Fri Sep 26 09:43:11 CEST 2008


>Date: Thu, 25 Sep 2008 23:37:05 -0800
>To: Oene <pa3cwn at tele2.nl>
>From: Edward Cole <kl7uw at acsalaska.net>
>Subject: Re: [Moon-net] 2.40m dish
>
>Oene,
>
>I am just putting together my 23cm eme station this fall.  I have a 
>4.9m aluminum skin dish which is medium size for this 
>band.  Generally, 3m and 150w is minimum recommendation, though some 
>do operate with a 2.4m dish.  I have a 2.4m fiberglass ku-band dish 
>that will be used for 3cm eme in a year or so.
>
>I am building a 300w sspa kit from W6PQL that cost me $867 
>USD.  Nice part is it is no-tune and can be mounted on the dish back 
>so avoiding long runs of very large hardline.  I will run 40w in the 
>shack thru 30m of 1/2-inch hardline to provide 20w drive needed at 
>PA.  Only needs 28-vdc.
>There is no local 23cm activity here in Alaska so that is not a 
>problem nor is RFI at this freq.  The signals are down by -15 to -20 
>dB at the dish edge so with a 2.5 degree beamwidth I will have to 
>point directly at neighbor for any significant RF to hit them.  Gain 
>is 34.9 dB, theoretically.  For a 3m dish gain is 30 dB.
>
>A transverter is the way to go.  You can use a 28-MHz IF but 144 or 
>432 is better for easier filtering of image and harmonics.  DB6NT 
>makes great stuff.  I am using a DEMI xvtr 144/1296 and 6w driver 
>amp to 60w first amp (all in the shack).  I have a two-stage WD5AGO 
>preamp with 0.30 dB noise figure and 31 dB gain.  I built one of the 
>OK1DFC septum feeds.
>
>I agree that 1296 is probably the second most popular eme band to 2m 
>and I understand that it is much quieter.  I am going to continue 
>QRV on 2m but will spend time on 23cm, and later 9cm and 3cm.  I 
>think WiFi interference on 13cm will make it a tough band so not 
>planning on that.  No plans for 6cm eme at this time but that might 
>change once the 4.9m dish is up!
>
>I'm not an expert, just a good student ;-)



***********************************************************
73, Ed - KL7UW              BP40iq, 6m - 3cm
144-EME: FT-847, mgf-1801, 4x-xp20, 185w
1296-EME: DEMI-Xvtr, 0.30 dBNF, 4.9m dish, 60W (soonQRV)
http://www.kl7uw.com       AK VHF-Up Group
NA Rep. for DUBUS: dubususa at hotmail.com
*********************************************************** 


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