Steve - using the Bird 43 originally with 2-30MHz 1Kw 1000H insert on 475kHz, and then compared it with a 1Kw 1000P 450kHz-2.5MHz insert and maybe (maybe) the 2-30MHz insert was showing low about 10% on this machine using 200W carrier power (clean sine) -

Note - Ive been told others have different cal tables and the differences were larger but I was surprised my Delta was so low between the plug elements. Measurements were using a Bird 500W Termaline and confirmed with Pk/Pk scope.

Im typically using the Dual metered (Phase and Z)  M0BMU Tuning meter and though for 136kHz gives good results on 475kHz and although it does affect the termination Z and phase a bit according to the AIM4170 I leave it in line and not gone thru a pair of FETS for a year or two - Ive not done the mods suggested for 500kHz as its used both for 136/475

Laurence GM4DMA

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From: [email protected] <[email protected]> on behalf of Steve <[email protected]>
Sent: Tuesday, November 1, 2016 12:52 PM
To: [email protected]
Subject: LF: SWR Bridges

 

Has anyone here had experience using (or attempting to use) an HF SWR bridge
on 630m and if so, what did you find out?


Thanks,

Steve


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