I pushed my latest code to main including the fix to the TX channel number.
Here is my decode of the RX devices.
RX Channel C – 145.840
0 - U405
Single Ended
35 N2HET1_9 AX5043_SEL3 U405-14 RX3 SEL Position 0
22 GIOA_7 AX5043_IRQ_RX3 U405-19 RX3_IRQ Position 0
AX5043 RX Device 3 - AX5043Dev2
RX Channel B – 145.810
1 - U305
Differential
33 N2HET1_7 AX5043_SEL2 U305-1 RX2 Select Position 1
126 GOIB_0 AX5043_IRQ_RX2 U305-19 RX2 IRQ` Position 1
AX5043 RX Device 2 - AX5043Dev1
RX Channel A – 145.780
2 - U205
Differential
24 N2HET1_3 AX5043_SEL1 U205-14 RX1_SEL Position 2 --- CONMFIRMED
SIGNAL
5 GIOA_1 AX5043_IRQ_RX1 U205-19 RX1_IRQ Position 2
AX5043 RX Device 1 - AX5043Dev0
RX Channel D – 145.870
3 - U505
Differential
36 N2HET1_4 AX5042_SEL4 U505-14 RX4 SEL Position 3
14 GIOA_5 AX5043_IRQ_RX4 U505-19 RX4_IRQ Position 3
AX5043 RX Device 4 - AX5043Dev3
73
Chris
--
Chris E. Thompson
chrisethompson(a)gmail.com
g0kla(a)arrl.net
Attached is a short discussion document for the Digipeater.
73
Chris
On Thu, Mar 14, 2024 at 2:26 PM Bill via pacsat-dev <pacsat-dev(a)amsat.org>
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My other meeting is tonight so I won't be there.
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
On Thu, Mar 14, 2024 at 2:26 PM Bill via pacsat-dev <pacsat-dev(a)amsat.org>
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Pacsat dev mtg 3-14-2024
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Thanks for the report. Thats cool!
I will be giving it a try.
Bob
On Mar 8, 2024, at 8:19 AM, Chris Thompson via pacsat-dev <pacsat-dev(a)amsat.org<mailto:[email protected]>> wrote:
Bob,
I left Blinky unplugged overnight and it started up this morning with the correct time from the RTC. So that is now working. The code change is in the main branch.
73
Chris
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Bob,
I left Blinky unplugged overnight and it started up this morning with the
correct time from the RTC. So that is now working. The code change is in
the main branch.
73
Chris
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Jim,
I sacrificed one of the little jumpers with the black thin coax. I probably should not cut more. I was going to order more from China but have not yet.
Scope is HP 54522A 500 MHz. Purchased on eBay.
Bob
________________________________
From: Jim McCullers via pacsat-dev <pacsat-dev(a)amsat.org>
Sent: Wednesday, March 6, 2024 9:00 AM
To: Bob Stricklin <bstrick(a)n5brg.com>; 'Pacsat Dev' <pacsat-dev(a)amsat.org>
Subject: [pacsat-dev] Re: Blinky Transmiter
Thanks for the box. At the moment it’s hanging.
The smallest coax I have is RG-174. I do have a few connectors with the same you use on the board to SMA and can sacrifice one except the coax is the transparent stiff variety, not certain of the number.
If your is more flexible and you can space an few inches send some with the box. Otherwise I can make something work. Need to raid the scrap cable bin.
What scope do you have? Now wish I had bought a 200mhz but settled for 100 and 4-channels analog. Digital scope is also 100mhz.
Hope to finish my RF probe tonight and test.
Jim
Jim, Thanks for your report.
I did reconnect the transformer to the 4X splinters using the fine coax and things seem to be working fine that way. I have not tried it with packet data yet but will do that when I can.
The image below is the dif input to one of the receivers. The south trace is offset by 1 cm so we can it it better. Phasing looks good. Noise is due to poor ground in my setup mostly I feel.
I received my 3D printer and I have printed three more of the plastic boxes for the programming board. I will mail you and Chris one maybe tomorrow.
Bob
[cid:[email protected]]
On Mar 5, 2024, at 4:02 PM, Jim McCullers via pacsat-dev <pacsat-dev(a)amsat.org<mailto:[email protected]>> wrote:
I did some analysis on Blinky’s transmitter last night and did not see the spurs Bob saw on his board.
My experience with using a spectrum analyzer close in looking for spurs or phase noise is limited so more analysis is needed.
I did look at the harmonics and the second was down 48 db from the fundamental (+15 to -33 dbm).
The third harmonic was in the noise and undetectable.
Now, for receiver board surgery.
Jim McCullers
WA4CWI
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