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Re: 2401/144 down conveter and antenna questions



Hi Tim and the group...  Check AMSAT Journal May/June 2006 and Aug/July 2007
for articles by VE3NPC on helical design and boom materials.

Quoting from conclusion in the May/June 2006 Page 20 #3 "The use of aluminum
for boom material has no affect on performance and the use of PVC also has
minimal affect ( at least for antennas up to 3 wavelengths in length)."

Use a bias-tee to power the down converter.  Depending on the power
regulator inside, you may be able to power it with as little as 12VDC.  You
need a signal source to confirm it is working at whatever voltage you find
will run on.  A noisy computer, a WIFI router/access point etc will do it
for a signal source.  Otherwise, making a source such as
http://ve2zaz.net/SigSourc/SigSourc.htm is very handy and inexpensive.




 

-----Original Message-----
From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On
Behalf Of CLAUDIA PIRKL
Sent: March 31, 2008 12:51 PM
To: AMSAT-BB@amsat.org
Subject: [amsat-bb] 2401/144 down conveter and antenna questions

Hello all. I found a 2401/144 down converter on the internet but when it
came in the mail there was no info with it. It is a TranSystem Model
AIDC-3733 and I think it came from K5GNA.
I removed one cover (antenna on left/144 IF facing me) and found a wire with
one end not connected. I realize it needs some DC volts to operate but how
much and where it needs to be brought in. Does any one  have any info to
help me out?

On the internet there a few helix antenna designs for 2401. I found a piece
of 1" PVC and some AL. ground wire. I wrapped the wire around the PVC and
came up with the 4cm dia. the article talked about. But, in another article
(435 Mhz) it was mentioned the PVC was very lossy. What do you think??

Thanks for any help!!

Tim  N5KI  EM65
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