Frank,

No secret, I use following:
1) SatPC32ISS for antenna tracking and doppler correction.
2) The doppler.SQF line I use: GREENCUBE,435309.05,435309.05,USB,USB,NOR,0,0,  To note that the frequency above was adjusted with the Soundmodem waterfall to have the audio well centre on 1600Hz, basically it is the USB offset for my rig and may be different for others/different rig.
3) UZ7HO GreenCube Soundmodem and GUI: http://uz7.ho.ua/greentnc.zip, Note matching the rig bandpass filter with the Soundmodem one (900-2100 Hz) helps to have a better S/N particularly if you have local QRM.
4) DK3WN GetKISS+ to forward telemetry (and the digipeater packets also) to Satnogs.
5) Rig is TS-2000 1k2 external TNC setting (menu 50F), TNC microHam DXP, 30 ele (15H/15V) circular Pol yagi, LNA and bandpass filter on the feeder. Same rig used for all LEO’s.
6) I also use the out-of-tree module (GNU radio developed by EA4GPZ for GreenCube  https://github.com/daniestevez/gr-satellites/ in parallel to monitor the downlink.

As regards the ACK message it is send only if you use Tx delay, however it is better to use Tx delay 0 for QSO to avoid unnecessary transmission by the bird (saving on-board power), with Tx delay 0 you will receive your own message as acknowledgement.

 Hope above may help all.

73

Jean Marc (3B8DU)

On Nov 17, 2022, at 9:40 PM, Frank <[email protected]> wrote:

Jean,
 
There must be some secret to getting a digi thru. I along with many others are not getting our packets through. I copy just fine.
 
I can work ISS on AX25 but not this sat.
 
I have all the right soundmodem and GUI programs and more than enough antenna and power. Doppler correction and antenna tracking by the SAT from CSNTechnologies. ALC not flickering. 
 
Many complain of not seeing the ACK’s anymore when a packet is accepted for digipeating.
 
Hope you can share the secret 😊
 
73
Frank
WA2NDV
 
 
From: Jean Marc Momple
Sent: Thursday, November 17, 2022 10:53 AM
To: AMSAT BB
Subject: [AMSAT-BB] GreenCube
 
Dear All,
 
I forgot to put a post about GreenCube (MEO, 5800 Km attitude) which is a great satellite for digipeating, many OM’s now connected. Just to illustrate: I already worked out 5 continents on this bird, only North America (out of footprint) and Antartica (no station QRV) missing. However there is a message delay Tx being experimented right now which enables worldwide contacts.
 
Great bird, suggest you try it.
 
73
 
Jean Marc (3B8DU)
 
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