All, I have hit a wall on bidirectional couplers for HF. I have breadboarded the bi-directional portion of the following attached bi-directional coupler circuit. It appears in principal to be the sam
Hello again Dan, I have not seen the circuit you refer to in the handbook. My latest copy is 1977. The circuit shown in fig. 1, page 5 looks like a 180 degree hybrid. Hybrids are difficult to constru
Mike, Thanks for the reply. The year of the handbook is 1995. There are 2 or 3 examples on bi-directional couplers in the back. The full schematic is on page 35 of the link, however the coupler porti
Transformer coupled broad-band directional couplers are notoriously difficult to construct. The reasons for this are that you have conflicting goals in the transformers, one is that a high secondary
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 20 Nov 2005 12:30:15 +0100 (CET)
I found that an easier way to make a high power dual directional coupler is the old 'monimatch' SWR bridge approach. Here you have a mainline (which I did with a 50 track on PC board, and two adjacen
Bob, Thanks for the detailed reply. My version is the 17th and while the exact figure references are off a little the observations seem relevant. If I read your reply correctly the shields should sep
Bob, Second quick follow up on the role of the Faraday shield. I reviewed a second, 20th addition of the handbook today. The second diagram with the horizontal shield is still, unchanged, in that ver
Hi Dan, After re-reading my description of the coupler I realized I was a bit careless. So, to revise part of my description: There are some problems with the schematic drawings found in the ARRL boo
Author: "Carcia, Francis A HS" <francis.carcia@hs.utc.com>
Date: Tue, 22 Nov 2005 11:42:15 -0500
The old ARRL SSB handbook had a schematic of the Collins power meter directional coupler. I built one years ago and set it up with 2 meters. The forward was calibrated 0 to 2000 watts and the reflect
Thanks again Bob, The explanation of the shield on the primary winding makes sense. I thing that is referred to as a Faraday shield. Your explanation makes sense, it shields the E field but not the H