Hi Tim,
I have used these BN-73-202 for quite a while. This is the only one that was in
such small pieces.
N2TK, Tony
From: Tim Shoppa <tshoppa@gmail.com>
Sent: Monday, October 5, 2020 8:42 AM
To: tony.kaz@verizon.net
Cc: topBand List <topband@contesting.com>
Subject: Re: Topband: Receive ant - binocular cores
Tony, I have abused BN-73-202 cores at the 100W level when I accidentally
transmit into the receive antenna through the transformer. I have smoked the
termination resistor but never damaged the transformer by transmitting into
them.
I have used single BN-73-202 cores at the several watt level continuously, in
step-up/step-down voltage inverter applications.
None of the above means that the core would survive a lightning strike.
The ferrite material is mechanically fragile. When (for example) PCB mounting
in outdoor conditions you have to take into account the lead stress from
temperature changes etc. I think the two-hole BN form is way more mechanically
robust than the skinny rings but I have broken both kinds due to mounting them
"too tightly down" to a PCB.
Tim N3QE
On Mon, Oct 5, 2020 at 7:19 AM tony.kaz--- via Topband <topband@contesting.com
<mailto:topband@contesting.com> > wrote:
I use BN-73-202 cores for my receive antennas - Pennants, BOGs.
Finally getting time to check out my receive antennas. One BOG was very low.
The BOG transformer was broken. I mean it was totally destroyed. The largest
piece was 1/8" long. The primary and secondary wires, #30 were intact and
neither open or shorted. The wire looked pristine. Any ideas what could do
that to a ferrite core? Any reason I should change anything other than just
wire another transformer?
N2TK, Tony
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