[amsat-bb] ukube-1 transponder

[Graham Shirville]

Hi Jack and others,

Many thanks for the confirmation that the FUNcube transponder on UKube-1 
is still performing "as advertised"!

There are presently three FUNcube transponders operating for your 
pleasure over the festivities as detailed below:)

The latest telemetry from AO73/FUNcube-1 and FUNcube-2 on UKube can 
always be seen here http://warehouse.funcube.org.uk/ and from 
EO88/Nayif-1 here http://data.amsat-uk.org/nayif1/index

73 Graham G3VZV


AO-73 FUNcube-1
The transponder is normally operational only when the satellite is in 
eclipse, ie the solar panels are NOT being illuminated. During weekends 
(from pm Fridays UTC to PM Sundays UTC), AND OVER THE CHRISTMAS 
HOLIDAYS, the transponder is operational 24/7.
When the transponder is switched off, the telemetry beacon is on full 
power, when the transponder is on the beacon it is on low power.
The nominal transponder frequencies are:
Uplink: 435.150 – 435.130 MHz LSB (Inverting)
Downlink: 145.950 – 145.970 MHz USB
Telemetry Tx: 145.935 MHz BPSK
(The passband may be up to 15kHz higher depending on on-board temps. 
Lower temperatures give higher freqs!)

FUNcube-2 (aka FUNcube on UKube)
The FUNcube-2 sub-system continues to operate autonomously and, almost 
continuously, in amateur mode. The transponder is operational and the 
telemetry downlink is functioning with about 70mW output. The FUNcube-1 
Dashboard does not correctly display the telemetry but it does correctly 
decode the data and uploads it to the FUNcube Data Warehouse from where 
it can be examined. The FUNcube standard real time data channels are 
operational in addition to the battery voltages, temperatures and ADCS 
data coming via the main On Board Computer (OBC).
The transponder is interrupted for a few seconds every 2 minutes when 
the other transmitter sends its CW beacon and, occasionally, for a few 
seconds when the main OBC reboots (approx seven times each orbit).
The nominal transponder frequencies are:
Uplink: 435.080 – 435.060 MHz LSB (Inverting)
Downlink: 145.930 – 145.950 MHz USB
Telemetry Tx: 145.915 MHz BPSK
(The passband may be up to 10kHz higher depending on on-board temps. Low 
temperatures give higher freqs!)


EO88/Nayif-1/FUNcube-5
EO88 is presently operating in autonomous mode. The transponder is 
operational when the satellite is in eclipse, ie the solar panels are 
NOT being illuminated.
When the transponder is switched off, the telemetry beacon is on full 
power, when the transponder is on the beacon it is on low power.
The transponder frequencies are:
Uplink: 435.045 – 435.015 MHz LSB (inverting)
Downlink: 145.960-145.990 MHz USB
Telemetry Tx: 145.940MHz


On 22/12/2017 22:04, jack weimer wrote:
> Ukube-1 transponder is working. I just had a contact with AA5PK Glenn in DM91 grid at 2127 Z  when the beacon comes on it distorts the transponder downlink so you have to wait until the beacon quicks in order to hear the transponder downlink  JACK  KC7MG
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