Re: LOTW Satellite name for ISS ?
The ISS is not a satellite. Satellite is an unmanned object the receives and retransmits but the ISS is manned. When you make a contact with them, your signal is not retransmitted. It terminates at the station.
Seems like the crossband repeater would be an exception but I can find no evidence that it is.
Karl R. Sandstrom, K5MAN Greenwell Springs, Louisiana
Yes..I can see both sides of that. You are correct that if we communicate with ISS directly, then it is a contact with a remote station.
But the repeater is not functionally different than, say, AO-51, just a bit lower.
Of course, it isnt functionally different than a terrestrial cross band repeater either--except for the antenna height :)
Karl Sandstrom wrote:
The ISS is not a satellite. Satellite is an unmanned object the receives and retransmits but the ISS is manned. When you make a contact with them, your signal is not retransmitted. It terminates at the station.
Seems like the crossband repeater would be an exception but I can find no evidence that it is.
Karl R. Sandstrom, K5MAN Greenwell Springs, Louisiana
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I sent a request to the LoTW help line regarding uploading ISS contacts. The answer was we cannot upload these as SAT contacts until the next revision of LoTW. They said "Stand by (not soon)"
So there you have it. I'll just hang on to them until later.
They all went ok to eQSL BTW with ARISS or ISS as SAT_NAME
Curt KU8L
Good Afternoon All:
I am working on packaging and interconnections for a mast-mounted unit for my 70cm system.
My plan now is to place the preamp, a diplexer, and t/r relay all inside a single aluminum box.
In and out will be N connectors.
Internally, I am thinking of SMA links and pigtails.
My 70 cm rig can produce a maximum of 35watts right now.
Do commercial coaxial relays for t/r use short the rx line when in tx? or do they leave it float?
Also, should the 2M output on the diplexer for desense be terminated? or left open.
Finally, what type small coax would be appropriate for use inside this box between modules?
Main feedline is LMR400.
Thanks
Curt KU8L
Curt Nixon wrote:
Do commercial coaxial relays for t/r use short the rx line when in tx? or do they leave it float?
No. I would recommend that you use a second low power relay to put 50R loads across both in and out of your preamp.
Also, should the 2M output on the diplexer for desense be terminated? or left open.
I think most people leave it open but personally, I would terminate it with a 50R resistor.
----- Original Message ----- From: "Curt Nixon" cptcurt@flash.net To: amsat-bb@amsat.org Sent: Sunday, December 07, 2008 7:23 PM Subject: [amsat-bb] Question re rx/tx relays and diplexer
Good Afternoon All:
I am working on packaging and interconnections for a mast-mounted unit for my 70cm system.
My plan now is to place the preamp, a diplexer, and t/r relay all inside a single aluminum box.
In and out will be N connectors.
Internally, I am thinking of SMA links and pigtails.
My 70 cm rig can produce a maximum of 35watts right now.
Do commercial coaxial relays for t/r use short the rx line when in tx? or do they leave it float?
Hi Curt KU8L
Commercial Tohtsu coaxial relay model CX 520 D shorts to ground the RX line when in TX and the TX line when in RX with 53 dB of insulation between ports at 500 MHz but be carefull because if your preamplifier is not unconditionally stable it can autoscillate when the input is grounded. There are commercially availabe relays that connect a built in 50 ohm termination to the RX line when in TX but the insulation is less.
Also, should the 2M output on the diplexer for desense be terminated? or left open.
It is not strictly necessary but if you have a 50 ohm termination availabe use it
Finally, what type small coax would be appropriate for use inside this box between modules?
Since you plan to use SMA connectors the RG 188 flexible teflon coax cable can be used into the box with suitable SMA connectors.
Main feedline is LMR400.
Thanks
Curt KU8L
73" de
i8CVS Domenico
The ISS is sometimes a satellite, and sometimes not. Depends on what you are doing. (And what side of the bed the appropriate ARRL official got up on.) There was a kerfuffle just before Field Day this year about counting digied packet contacts. It eventually was a moot point, since the digi was turned off just before Field Day.
Alan WA4SCA
participants (5)
-
Alan P. Biddle -
Curt Nixon -
i8cvs -
Karl Sandstrom -
Nigel Gunn G8IFF/W8IFF