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Re: AO-40 Mode U/S Report of this morning.



Good Morning Yoshi,

Thank you for the first AO40 report from JA.  It is encouraging to see that
the AGC values are coming down from what was seen during the first period of
transponder activity.

I would be very interested in hearing additional reports from stations
regarding the uplink requirements during the period were the AGC was
averaging only 0.8db.

Lee-KU4OS
----- Original Message -----
From: "Yoshihiro Imaishi" <imaishi@aa.mbn.or.jp>
To: "AMSAT-bb" <amsat-bb@AMSAT.Org>
Sent: Monday, May 07, 2001 0:43 AM
Subject: [amsat-bb] AO-40 Mode U/S Report of this morning.


> Hello all. This is Yoshi JF6BCC.
>
>   I tried to QRV on AO-40's Mode-U/S during 2050-2120z on orbit#237 this
> morning.
>
> loop: 2050z 319 on 2401.232MHz
> wkd : JA1BLC (2103-2108z. His539-My539 2401.357MHz)
> hrd : JA1VDJ (539 2401.357MHz)
>       VK2DAG (539 2401.357MHz)
>       JA0BBW (539 2401.357MHz)
>
>   U   - Uplink : IC-821 20W and 6ele YAGI (around 10dBi?) for FM sat. This
>                  antenna is fixed at elevation 25 degrees. AO-40 was at
>                  elevation 50 degrees so the gain will be -3dB of front.
>                  So my EIRP will be 100W or less.
>   S2 -Downlink : MAKI 29ele LOOP YAGI (21dBi)
>                  -> NE34S01 LNA (NF 0.3dB, Gain 15dB)
>                  -> Basic modified Drake2880
>                  -> 75ohm TV coax 5C-FV 7m
>                  -> ATT 15dB within IC-821 (2m)
>
>   I had 2 systems of S2 hearing, but this morning I could only 1 of them
> due to the bad direction of Sat. So I could not hear both beacon and QSO
> signals at the same time.
>   So I watched S2-MB during 2030-2217z (except 2050-2120z) and checked
> the U-Rx AGC value. It was 0.8dB at before and 6.6dB at after. That means
> the uplink band was quiet enough.
>
>   During this time, I also made CQ by CW with 50W EIRP but could not
contact
> any. My signal was 419 and beacon was S5. Maybe my signal was -15dB or
less
> than S2-MB :-)
>
>   I do not have any equipments for L-Uplink so I could not try Mode-L/S.
>
>   Due to the bad direction of Sat, and of my weekly time schedule, I could
> not QRV enough. We Japanese also have a chance tonight again so I will QRV
> again.
>
>   See you soon! de Yoshi JF6BCC.
>
> JST  MA  U-AGC(dB)  * JST = UTC + 9hours
> ---- --- ---------
>  :
> 5:30 141   1.5
> 5:31 142   2.8
> 5:31 142   1.0
> 5:32 142  -1.7
> 5:32 142  -0.4
> 5:33 142  -0.8
> 5:33 142  -1.3
> 5:34 142   4.7
> 5:35 142  -1.7
> 5:36 143  -1.3
> 5:36 143  -1.7
> 5:37 143   1.9
> 5:38 143   0.1
> 5:39 143  -0.4
> 5:43 144   5.6
> 5:44 145  -1.3
> 5:45 145   0.1
> 5:45 145   0.1
> 5:46 145   0.5
> 5:47 145   5.1
> 5:50 146   4.7
> 5:50 146   0.5
>  :    :     :   <- My QRV Time. I could not copy telem. :-p
> 6:20 153   3.3
> 6:21 153   4.7
> 6:22 153   5.1
> 6:22 153   3.7
> 6:23 153   7.4
> 6:24 154   5.6
> 6:25 154   4.2
> 6:26 154   5.6
> 6:27 154   6.0
> 6:29 155   6.5
> 6:29 155   8.3
> 6:31 155   5.1
> 6:31 155   6.0
> 6:32 155   8.8
> 6:32 155   7.9
> 6:33 156  10.1
> 6:34 156   7.4
> 6:36 156   8.3
> 6:37 157   7.9
> 6:39 157   6.0
> 6:42 158   5.6
> 6:43 158   6.0
> 6:43 158   8.3
> 6:44 158   5.1
> 6:47 159   5.1
> 6:48 159   7.4
> 6:51 160  11.5
> 6:51 160   6.5
>  :
> ----------------
> Avarage - 5:14-5:50 : 0.8dB
> Avarage - 6:20-6:51 : 6.6dB
>
>
> Yoshihiro Imaishi JF6BCC/KH2GR
> GL:PM53JV, ex KC6IY(T88IY),V63BP
> mailto:jf6bcc@jarl.com or jf6bcc@jamsat.or.jp
> <http://plaza16.mbn.or.jp/~palau/> Sorry, Japanese only now.
> ----
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>

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