https://forums.qrz.com/index.php?threads/fox-1e-another-amsat-na-failed-sate...
W5SAT has indicated that Fox-1E may be on and "transponding" - but only with extremely strong signals.
--Roy K3RLD
I monitored 435-438 MHz last night with an SDR to look for a signal. My heatmap shows CAPE 3 at 437.325 MHz and an unknown signal at 436.6 MHz. Does anyone know what that could be? I didn't see any of the satellites from that launch listing that frequency, nor were the other active satellites with that frequency over me at the time (at least that I could find).
There is a weak blip at 435.785 MHz around the same time, but with poor SNR.
The heatmap is here: https://www.dropbox.com/s/axpcpgvu6tepr3c/fox-1e-20200128-cut1.png?dl=0
Timestamp is in Eastern Time.
-Stephen N8URE
On 1/28/21 9:26 AM, [email protected] wrote:
I monitored 435-438 MHz last night with an SDR to look for a signal. My heatmap shows CAPE 3 at 437.325 MHz and an unknown signal at 436.6 MHz. Does anyone know what that could be? I didn't see any of the satellites from that launch listing that frequency, nor were the other active satellites with that frequency over me at the time (at least that I could find).
There is a weak blip at 435.785 MHz around the same time, but with poor SNR.
The blip I see, zooming into your picture, at 435.690 to 435.700 at 23:46 looks like the "Fox tail". Depending on your SDR dongle, being off of the advertised beacon at 435.750 by that much might make sense.
Perhaps I missed it, but what antenna configuration are you using?
--- Zach N0ZGO
I just have my 5 element yagi pointed southwest, with vertical polarization. The radio is an SDR dongle with a 410-755 MHZ bandpass filter attached. I use the rtl_power script to acquire the spectrum, with 10s averaging.
From the doppler, I can tell the general direction of the satellites. So the CAPE-3 signal at 437.325 is consistent with the satellite going S->N, and whatever the signal at 436.6 is appears to be from an unrelated satellite crossing the T of the antenna.
Since there's only a very weak signal at 435.75, I can't really tell what the doppler is.
I will keep listening, especially if people want to try TXing to the satellite, as it's probably better to have separate stations on the RX end to ensure it's not just a harmonic being picked up by the TX station.
-Stephen N8URE
Hi Stephan,
436.600 can be AISTECHSAT-2, BOBCAT-1 or MEZNAT
Jan PE0SAT
On 28-01-2021 16:26, [email protected] wrote:
I monitored 435-438 MHz last night with an SDR to look for a signal. My heatmap shows CAPE 3 at 437.325 MHz and an unknown signal at 436.6 MHz. Does anyone know what that could be? I didn't see any of the satellites from that launch listing that frequency, nor were the other active satellites with that frequency over me at the time (at least that I could find).
There is a weak blip at 435.785 MHz around the same time, but with poor SNR.
The heatmap is here: https://www.dropbox.com/s/axpcpgvu6tepr3c/fox-1e-20200128-cut1.png?dl=0
Timestamp is in Eastern Time.
-Stephen N8URE
Thanks Jan,
None of those match the time I heard it. I also checked SwampSat-2 but it wasn't overhead. I will listen again for a few nights and track the pass timings.
-Stephen N8URE
The only known satellite above your QTH at 4:36 UTC (right?) at 436.600 MHz it was Bobcat-1, are you 100% sure signal wasn't from it? I wouldn't insist but the signal looks like the one that Bobcat-1 transmits.
73, fredy
On 1/28/21 10:00 PM, [email protected] wrote:
Thanks Jan,
None of those match the time I heard it. I also checked SwampSat-2 but it wasn't overhead. I will listen again for a few nights and track the pass timings.
-Stephen N8URE
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Thanks Fredy! I was using the nasabare.txt TLEs, and it showed Bobcat-1 between Japan and Alaska at the time. But it turns out the TLE in nasabare is very old, even in the latest version! Using the TLE from Celestrak indeed shows it over me. So I guess I have to use Celestrak TLEs for this exercise, otherwise I'll be finding zombie satellites everywhere.
73, Stephen
But it turns out the TLE in nasabare is very old, even in the latest version!
I am showing that the TLE for Bobcat-1 is dated 14 hours ago in nasabare.txt. Perhaps you are looking at a cached copy?
de KM1P
Here's what I get from nasabare.txt just now:
Bobcat-1 1 46921U 98067RR 21028.50303703 .00009907 00000-0 17081-3 0 9991 2 46921 51.6440 312.5059 0001077 270.0391 90.0475 15.51703786 13110
Here is the Celestrak TLE:
BOBCAT-1 1 46922U 98067RS 21028.16689903 .00013398 00000-0 22393-3 0 9994 2 46922 51.6444 314.0135 0000588 267.5437 92.5486 15.52237632 13027
They give very different positions.
But look, the NORAD designation is different! 46921 is actually SPOC. They names have been swapped in nasabare.txt
-Stephen N8URE
Thanks for noticing the object number discrepancy. nasabare.txt is now updated to match Space-track and Celestrak objects for SPOC and Bobcat-1
de KM1P Joe
________________________________________ From: [email protected] [email protected] Sent: Thursday, January 28, 2021 9:58 PM To: [email protected] Subject: [AMSAT-BB] Re: Fox-1E Heard?
Here's what I get from nasabare.txt just now:
Bobcat-1 1 46921U 98067RR 21028.50303703 .00009907 00000-0 17081-3 0 9991 2 46921 51.6440 312.5059 0001077 270.0391 90.0475 15.51703786 13110
Here is the Celestrak TLE:
BOBCAT-1 1 46922U 98067RS 21028.16689903 .00013398 00000-0 22393-3 0 9994 2 46922 51.6444 314.0135 0000588 267.5437 92.5486 15.52237632 13027
They give very different positions.
But look, the NORAD designation is different! 46921 is actually SPOC. They names have been swapped in nasabare.txt
-Stephen N8URE
-----------------------------------------------------------
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Stephen,
The celestrak TLE looks up2date with respects to the element set and revolution number, per the latest space control squadron data.
Joseph Armbruster KJ4JIO
On Thu, Jan 28, 2021 at 9:59 PM [email protected] wrote:
Here's what I get from nasabare.txt just now:
Bobcat-1 1 46921U 98067RR 21028.50303703 .00009907 00000-0 17081-3 0 9991 2 46921 51.6440 312.5059 0001077 270.0391 90.0475 15.51703786 13110
Here is the Celestrak TLE:
BOBCAT-1 1 46922U 98067RS 21028.16689903 .00013398 00000-0 22393-3 0 9994 2 46922 51.6444 314.0135 0000588 267.5437 92.5486 15.52237632 13027
They give very different positions.
But look, the NORAD designation is different! 46921 is actually SPOC. They names have been swapped in nasabare.txt
-Stephen N8URE
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
We figured it out. SPOC and Bobcat-1 were swapped in nasabare, but it's now been fixed.
-Stephen N8URE
participants (7)
-
Alfredos (fredy) Damkalis -
Joseph Armbruster -
Joseph B. Fitzgerald -
PE0SAT | Amateur Radio -
Roy Dean -
sjdevience＠gmail.com -
Zach Metzinger