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I've captured the datasheets of the most common ferrites and powdered iron toroids using in amateur radio into an RF Toroid Calculator that makes it easy to compare characteristics using sliders. If

Nicole, Arrow are good and I use them from time to time, but it seems like they are alway out of stock.? Everett N4CY Sent from the all new AOL app for iOS

I’ve bought ferrites from Arrow.com, they were reasonably priced and shipping was fast and fair too.

Fair-Rite has toroids for both Suppression and Inductive applications. for example, FT240-43, can be either Fair-rite part numbers 5943003801 (inductive) or 2643803802 (suppression). Each has a

Dave, ?If you are looking at Kit-Parts website they have 240 sizes in several mixes, 31, 43, 52 and 61. ?Everett N4CY

Take the following from their site: [image: image.png] I would presume this is 31 material and 1.020 inches in OD? But when I double click on that which is supposed to give the specifications, it is

Amadon is the worst place to go, their prices are very high, they have a high minimum order and their shipping cost are outrages. ?The link I gave for Kit-Parts is the best place to go. All of his

Amidon re-sells Fair-Rite cores. It is an "unauthorized" distributor. They copy the material designation (EG, 31) but have their own numbering system for the shape. However, Fair-Rite's material

The best place to go for small orders is https://www.kitsandparts.com/toroids.php?Everett N4CY

Do not use the "no-name" ferrites, especially from China. They typically are not mixed well before firing, are not properly fired, many are cracked, and they are not deburred. Worst of all, they

Cable protection or even burying in gnd via suitable conduit is good..stops the bloody foxes here in London..( fcukers are everywhere!) Saying on gnd or below because qro transmissions will ingress

Hi, You guys often use terms like FTxxx-yy or BNxxx-yy to refer to various ferrite products - like "use x turns on a FT240-31 for this application". By that, do you have any particular manufacturer /

Thank you for the clarification on TX-SDR isolation. It would have been nice if you has a hybrid splitter (for receive) in the design instead of using a T connector and a 3 .7 db pad on the receive

From my experience as a former cellphone base station engineer in Southern England, I found that the most common culprits in rural sites were small woodmice. They even managed to get inside the cabins

Maybe, but in woodland it's likely to get chewed by various animals, unless you run it in some hose pipe or similar protection. Even if it is a few feet up in the sky, squirrels will be tempted to

On the ground would be better..

Best person to ask is LZ1AQ. Great guy and always responds. I have about a 50 foot run and it works fine. I have no choke on it. Mike AB4KJ

A 30m (100ft) length of Cat 5 has typically 3 dB of attenuation at 30MHz, 2dB at 10MHz and <1dB at 1MHz. If your receiver noise floor rises by >6dB when the antenna is connected, you won't have a

13 January 2022 I bought an LZ1AQ active antenna amplifier to try. The performance of my Wellbrook wide aperture loop has been excellent since moving it further from the house, so I would like to try

Just some answers: 1.? >>The isolation between transmit and SDR receive is not good enough on this product.? It will work OK for QRP but not with a transmitter using more than 10 watts. 1. I think