RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Scanners, Receivers and Related Equipment Forums > Antennas and Associated Hardware > Splitters, Filters and Multicouplers


Splitters, Filters and Multicouplers - For discussion of all inline devices used to split, combine or amplify a receive signal. This forum is not for any bi-directional (transmit) device. Use the Amateur or Commercial Radio forums for those.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 04-02-2015, 4:44 PM
alabamarailfan's Avatar
Member
  Shack Photos
Shack photos
Audio Feed Provider
Audio Feed Provider
Amateur Radio Operator
Amateur Radio
 
Join Date: Jan 2009
Posts: 103
Default Help IDing this Celwave Part 639080

Hey Folks,
Hoping someone might be able to identify this part I picked up off eBay. The seller figured it was a pre-amp since it looks like a lot of Celwave pre-amps (albeit, a little smaller) but when I got it in and started looking at it, I am not sure. I don't have access to RF equipment to test it with (other than radios and SWR meters).

Here is the info printed on the label (visible in the photos as well):

CELWAVE
MODEL 639080 REV 8
FREQ 406 - 512 MHZ 806 - 920 M

Since there was no input/output only J1 and J2, this made me leery that it wasn't actually a pre-amp. The box is sealed (unlike Celwave pre-amps I have used before), so there is no popping it open to see what kind of guts are in it.

About all I can find on the Internet it that is could be used in a Celwave Multicoupler shelf. I found a model for sale of TDF6491A but still can't find out exactly what part this unit plays in the multi-coupler. Seems too small to be a pre-selector/filter and why would it have power. I applied 12VDC and there was no clicking or anything so I don't think it is a relay.

Thank you in advance for any input!
john
Attached Images
  
__________________
John D. Peterson/W4JDP
Decatur, AL Railroad Scanner Feed:
http://www.alabamarailfan.com/live-scanner.php
Decatur, AL Public Safety Scanner Feed: http://www.alabamarailfan.com/pubsafety.php
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 04-02-2015, 7:07 PM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: May 2003
Posts: 274
Default

I'm pretty sure that's the bias T that injects DC up the coax to power a tower top amplifier, the multicoupler shelf normally includes an amp meter to monitor the TTA current supplied by this device.
Reply With Quote
  #3 (permalink)  
Old 04-02-2015, 8:27 PM
alabamarailfan's Avatar
Member
  Shack Photos
Shack photos
Audio Feed Provider
Audio Feed Provider
Amateur Radio Operator
Amateur Radio
 
Join Date: Jan 2009
Posts: 103
Default

Thanks for the input, kf8yk! I was wondering about a power injector as well. I just applied power and verified that power is output on the J1 port so that pretty much solves it!

Thanks again for the help and input! 73!
john
__________________
John D. Peterson/W4JDP
Decatur, AL Railroad Scanner Feed:
http://www.alabamarailfan.com/live-scanner.php
Decatur, AL Public Safety Scanner Feed: http://www.alabamarailfan.com/pubsafety.php
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 1:31 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions