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Author Topic: Preamp suggestions for ARISS ?  (Read 4647 times)
VA7CPC
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« on: April 14, 2013, 11:21:23 PM »

Hi --

My club is getting involved in the "ISS-in-the-schools" program.  We are assembling (borrowing / buying / begging) equipment, and getting some expertise in its use.

This is _not_ normal "ham radio" -- it's a "this must not fail!" public-relations event.

. . . Can somebody recommend a mast-mounted preamp?

Preferably inexpensive, preferably not easy to destroy by a switching mistake.  I don't think we can tell the difference between a 1 dB noise figure, and a 0.5 dB noise figure.

We may be able to borrow an IC-9100 for the event.  From what I've read, that rig is very flexible, and well-suited to satellite QSO's, but not easy to learn.

. . . Is there something which is clearly better?

Thanks --

.                    Charles

PS -- I'm posting here because the "ISS Fan Club" is pretty quiet . . .
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KQ6EA
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« Reply #1 on: April 15, 2013, 08:02:42 AM »

Either SSB Electronic, or Advanced receiver Research would meet your needs.

RF switched, and either power up the coax, or separate power leads.

http://www.ssbusa.com/gaasfet.html

http://www.advancedreceiver.com/page7.html

Jim
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KB1PVH
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« Reply #2 on: April 16, 2013, 08:25:29 PM »

I'll second the ARR preamps. I have the 160 watt models and power them through the coax with my 910, and now my new 9100. I would recommend SATPC32 for radio and rotor control.

Dave-KB1PVH
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UT9UF
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« Reply #3 on: April 17, 2013, 11:43:29 AM »

Hi Charles,
Having 4 ARISS contacts organized since 2012 Im pretty sure that you do not need any preamp if you going to use standard 145 mhz.
If you coax is not very long (roughlyless than 30m) it will works without any issue. ISS has high power. Setup we are using is 5x5 cross
yagi, g-5500, ic-910h and that is it.

Andy
ariss-ua.blogspot.com

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KQ6EA
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« Reply #4 on: April 17, 2013, 03:28:09 PM »

It might not be *needed*, but it is required.

Jim
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VA7CPC
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« Reply #5 on: April 18, 2013, 09:35:55 PM »

Some additional information about our setup:

 
. . . Antenna: Hy-gain VB216SAT
 
. . . Radio : Either IC-7000 or IC-9100
 
. . . Coax Cable : FLL240SFPU   approx length 130 Feet  or   40 meter
 
We own the IC-7000.   The IC-9100 (which seems to be specially set up for satellite work) would be on loan from Icom.

The noise figure on the IC-9100 is (I think) 4 dB.  So Icom didn't put a real high-performance front end into it.  That won't matter (and neither will the noise figure on the IC-7000) with a mast-mounted preamp.

.                Charles
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KQ6EA
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« Reply #6 on: April 18, 2013, 09:40:01 PM »

What type of coax is that?

The only "240" coax I've used has been Times LMR-240, which is about a size in between RG-58 and RG-8X.
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VA7CPC
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« Reply #7 on: April 19, 2013, 07:18:15 AM »

What type of coax is that?

The only "240" coax I've used has been Times LMR-240, which is about a size in between RG-58 and RG-8X.

 
Yes, the FLL240SFPU size is between RG-58 and RG-8X.  So it's probably LMR-240.

.                 Charles
 
 
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KQ6EA
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« Reply #8 on: April 19, 2013, 09:28:51 AM »

Could you get some larger, lower-loss coax?

A run of 130' of 240-sized coax will be a bit lossy on 70cm.
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AE5QB
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« Reply #9 on: April 19, 2013, 02:40:13 PM »

Charles, we just successfully completed our ARISS contact on March 25th.  We have equipment that we are selling to fund future projects.  If you want to contact me offline, I will be happy to share our experiences and equipment details. We are selling everything at a reasonable discount so if you are interested in  purchasing or just exchanging information please contact me at maxwell at aol dot com.

73,

Tom/AE5QB
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VA7CPC
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« Reply #10 on: April 19, 2013, 03:21:19 PM »

Those who search (hard) will find . . .

. . . We now have access to LMR-400 cable.

.                Charles

PS -- Tom -- I'll pass that offer to Important People.  Thank you!
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KQ6EA
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« Reply #11 on: April 19, 2013, 03:43:56 PM »

I think for the length you mentioned you'll be much better off with the larger cable.
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