[600MRG] FT-37-WC toroid

[Paul N1BUG FN55mf]

Thanks Eric.

These are for RX systems. I'm not sure when I will be able to return to
transmitting but I will save your TX core suggestions for future use. I
still have my previous TX equipment with the exception of the 630m amp
which failed. I will probably build something a bit more robust to
replace it.

73,
Paul N1BUG



On 11/20/2024 5:36 PM, Eric NO3M wrote:
> Paul
>
> The Magnetics cores should work well, I've used them for various
> applications at LF.  I assume this is for an RX or lower power TX
> application.  If you need something for higher power applications, I've
> used any of the following for transformers in LF/MF amplifiers:
>
> Magnetics ZW43615TC
> EPCOS/TDK B64290L0674X038
> Ferroxcube TX36/23/15-3E10-M
>
> All current amplifiers are using the Ferroxcube ones.  All of the above
> can be sourced from Digikey.
>
> GL 73
> Eric NO3M
>
>
>
> On 11/20/24 3:43 PM, Paul N1BUG FN55mf wrote:
>> I've bought parts from Amazon, but I don't entirely trust them. They
>> don't admit to having these high permeability toroids.
>>
>> Since learning this is u=10,000 material, I found two options that
>> should be very near equivalents to the FT-37-WC.
>>
>> Uncoated:
>> Fair-Rite 5976000201 at 67 cents each from Digi-Key
>>
>> Parylene coated:
>> Magnetics YW41003TC at 68 cents each from Digi-Key
>>
>> Parylene is rated to 130 degrees C vs. 200 degrees C for the epoxy ones
>> from Amidon, but if they ever get anywhere near that temperature I've
>> got much bigger problems!
>>
>> I'm ordering a few of each. The price goes down significantly if you buy
>> 10 or more.
>>
>> 73,
>> Paul N1BUG
>>
>>
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