Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1] 2 Next   Go Down
  Print  
Author Topic: Feed line over 50ft  (Read 2908 times)
JLUYT123
Member

Posts: 6




Ignore
« on: September 24, 2012, 05:32:38 PM »

Hi all,

My best location to mount my new Arrow OSJ-146/440. Initially I will use an SDR on it and later buy a more appropriate mobile receiver to serve as my base station to work satellites.

My question is, since my feed line will be just over 50ft... I think about 60 ft, what coax should I use and what other components should I bare in mind?

Sincerely,
J
Logged
WB2WIK
Member

Posts: 20611




Ignore
« Reply #1 on: September 24, 2012, 05:39:52 PM »

LMR400 would be a good choice.
Logged
K8POS
Member

Posts: 332


WWW

Ignore
« Reply #2 on: September 24, 2012, 09:36:40 PM »

I agree LMR400.
While you can always put out more power to make up for the line loss, it is very hard to make up for the loss in receive signal.
Buy 100' worth.  Trust me you will want to get it higher in the future.
Bob
Logged
K5LXP
Member

Posts: 4506


WWW

Ignore
« Reply #3 on: September 24, 2012, 09:42:18 PM »

Trust me you will want to get it higher in the future.

And use a different antenna.

Mark K5LXP
Albuquerque, NM
Logged
WX7G
Member

Posts: 6130




Ignore
« Reply #4 on: September 24, 2012, 10:47:02 PM »

http://static.dxengineering.com/global/images/chartsguides/d/dxe-coax-specs.pdf

This link lists the loss for popular coaxial cables.
Logged
K1WJ
Member

Posts: 458




Ignore
« Reply #5 on: September 25, 2012, 01:57:48 PM »

Use 9913 - as little as needed to get the job done. 73 K1WJ
Logged
JLUYT123
Member

Posts: 6




Ignore
« Reply #6 on: September 27, 2012, 06:01:21 PM »

Thanks for everyone's input... I appreciate it. I ordered my lmr 400 and want to know about f connectors for  this coax.

Can I use normal rg6 connectors or are they special for lmr 400?
Logged
K5LXP
Member

Posts: 4506


WWW

Ignore
« Reply #7 on: September 27, 2012, 09:16:20 PM »

I ordered my lmr 400 and want to know about f connectors for  this coax. Can I use normal rg6 connectors or are they special for lmr 400?

F connectors are typically for RG-6 or RG-59, 75 ohm applications.  LMR400 is 1/2" 50 ohm line.  You could probably get a series of adapters to get from LMR400 to F but one would have to wonder just what you're going to use it for. 


Mark K5LXP
Albuquerque, NM
Logged
WB6BYU
Member

Posts: 13335




Ignore
« Reply #8 on: September 28, 2012, 12:26:25 PM »

LMR400 uses the same connectors as RG-8 or RG-213.
Logged
AA4HA
Member

Posts: 1482




Ignore
« Reply #9 on: September 28, 2012, 05:02:23 PM »

I would really suggest a change of antennas if you are going to work satellites. A turnstile antenna is a good starter (circularly polarized) and if you really are in the mood to experement with copper tubing and making neat loops you can build a quadrifilar helix antenna or buy a VHF/UHF helix pair of antennas for around $150.

With a better antenna you may be getting a significant boost in receiver performance and locking on as soon as the satellite clears the horizon.
Logged

Ms. Tisha Hayes, AA4HA
Lookout Mountain, Alabama
N4CR
Member

Posts: 1672




Ignore
« Reply #10 on: September 29, 2012, 09:53:17 AM »

LMR400 is 1/2" 50 ohm line.

... that is .400 inches in diameter.
Logged

73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
JLUYT123
Member

Posts: 6




Ignore
« Reply #11 on: September 29, 2012, 11:48:53 AM »

Firstly this setup will be connected to an SDR (RTL chipset) that has a male PAL connector on it. So far I can only find F -> PAL adapters. This will be the first use I will use this cabling for. I think I will have my license by November/December, after which I will buy an HT and can at least still leverage the antenna when I am not out and about.

I know this is not the perfect antenna for SATs but I wanted a good general purpose antenna on the SDR. I did not reply to the antenna input since I prefer to keep the thread on-topic.

Thanks, now I know my LMR 400 will serve me well and that I can use RG6 connectors on LMR 400 -- that is great news for me.

Sincerely,

J
Logged
K4RVN
Member

Posts: 778




Ignore
« Reply #12 on: September 29, 2012, 06:12:14 PM »

Just curious , how do you plan to use RG6 connectors on the LMR 400?
Have you found an adapter?

Frank
Logged
WB6BYU
Member

Posts: 13335




Ignore
« Reply #13 on: September 29, 2012, 07:18:26 PM »

You can put a PL-259 or type N connector on the LMR-400.  There are other types that
are available, but will be more expensive.  Adaptors from a PL-259 to a BNC are common,
and Radio Shack used to carry BNC to F adaptors.  That probably is the easiest way to
get to a type F at the minimum expense.  I've never seen a type F on LMR-400, since
they typically rely on the center conductor of the coax as the center of the connector,
and the wire in LMR-400 is much too thick for that purpose.

If you aren't skilled at putting on coax connectors there are a number of sources where
you can order the cable with connectors installed:  you can ask them what other types
they can put on for you.

If you have to have an F connector on the coax, then you could also use an adaptor
right at the antenna to RG-6 with F connectors on each end.  I have some RG-6
with BNC connectors that could be used with an adaptor on each end.


Logged
K4RVN
Member

Posts: 778




Ignore
« Reply #14 on: September 30, 2012, 01:59:30 PM »

Yep,
I checked and they still carry them so with a pl259 and couple of adaptors it could still be done with radio shack off the shelf purchases. Thanks for the lesson.

Frank
 
Logged
Pages: [1] 2 Next   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!