A "cheap fix" would be a FWD-REF takeoff bridge--SD's colleges' electronic
lab/engineering surely must have a SHF oscilliscope--or the students able to
slap together a decade freq divider to put before a slower scope...

John
--
When Viagra fails to work--you are DOOMED!!!

"Bob Miller" wrote in message
...
| On Sun, 08 May 2005 06:54:50 -0700, Wes Stewart
| wrote:
|
| On Sun, 08 May 2005 00:19:04 GMT, Bob Miller
| wrote:
|
| On Sat, 07 May 2005 16:14:15 -0700, wrote:
|
| What tool would one use to measure the SWR at 900Mhz?
|
| I've never seen swr bridges that went that high.
|
| A specific model number and source would be helpful...
|
|
| Paul (Kl7JG)
|
|
|
| The manual for my Bird 43 watt meter says it is rated for service up
| to 2300 Mhz. I've used it up to the 440 Mhz range with no problem.
|
| One Bird source is http://www.rfparts.com/
|
| Another, with both new and used Birds is http://www.radiodan.com/
|
| The problem with the Bird is that it requires considerable power to
| run it. With 1 watt available, you're (the OP) kind of out of luck.
|
| Bird does have a 1-watt measuring element, part 800-1, for 800-950 Mhz
| -- there's also a 2.5 watts element, the 800-2.
|
| Still, this is all may a bit pricey, about $4-500 for the meter and
| one element -- maybe he can borrow?
|
| bob
| k5qwg
|
|
|
| The OP has access to a spectrum analyzer/tracking generator. I
| suggest a directional coupler with the main arm driven by the
| generator, the coupled arm as the input to the SA and the thru port to
| the DUT. Calibrate the SA with a short on the output of the coupler
| (100% reflection) and measure return loss directly in dB on the
| screen.
|
| A similar idea using diode detection is he
|
| http://www.qsl.net/n9zia/24swr/
|
|