Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old February 22nd 04, 02:35 PM
owen.home
 
Posts: n/a
Default TS-118A/AP, RF Wattmeter/Dummy load

Hello
I recently went to buy an RF sweep generator and ended up bringing home a
TS-118A/AP (Bird) RF wattmeter, as one does! I have some questions:-
1. Given that the RF power sensors for the various bands/power ratings are
added external to the meter with only the coax connecting through to the
unit,how does it work? I assume the sensors are thermocouple types but
there's no separate DC circuit and I can only see a narrow constriction in
the sensor with the centre core being a very fine wire.
2. I'm missing the calibration/multiplication factor graph for the MX-1784/U
sensor, would anyone have one they'd be prepared to scan and email for me?
Any pointers to a full manual on the net would be good also.
3. Although the unit is marked 20-1400MHz at 500W, the MX-1783/U graph shows
power levels up to 1200W at 40MHz, I guess the unit is very conservatively
rated but does anyone have true figures (not that I intend to work at that
sort of power levels).
4. Is it OK to use as a straight dummy load without the sensor, I've tested
it at 2m and it seems fine but why the 20MHz lower limit? also it doesn't
measure 50 ohms at DC so I guess it can't be a straight resistor so what's
the load?

I'd appreciate all and any information you can give about the wattmeter,
it's not something I'd have planned on buying but it looks like it'll serve
all the needs I'd ever have for a high power dummy load/wattmeter other than
for the lower HF bands.
Thanks in advance
John



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Why Match ? PDRUNEN Antenna 16 December 22nd 04 07:40 AM
Tx Source Impedance & Load Reflections Richard Fry Antenna 8 May 28th 04 06:29 PM
TS-118A/AP, RF Wattmeter/Dummy load owen.home Homebrew 4 February 22nd 04 07:24 PM
RF amps: tuned load in Class A? Don Pearce Homebrew 141 September 15th 03 05:02 AM
Load matching puzzle Tom Bruhns Antenna 4 August 24th 03 01:22 AM


All times are GMT +1. The time now is 10:37 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017