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Not really Mike. I have a 70w MosFet kit arriving on the slow boat where I intend to replace the IRF5xx with the MRF101's .

What you missed in the above boards was their matching network being wholly unsuitable and not modifiable for HF frequencies. Well, not without such modifications that starting from scratch would be easier and cheaper.

better would be https://qrpblog.com/2019/10/a-600w-broadband-hf-amplifier-using-affordable-ldmos-devices/
At just a bit over 50 cents a watt it's a bargain. Even adding the low pass filter board it's still within $1/watt .

I'll repeat that abusing the output side of these devices is not recommended however they will withstand an enormous amount of abuse. Mishandle the input even a little bit and they die.

Another option is approaching RFMW or NXP directly for the MRF101 design essentials kit. This gives you a board , a heatsink, two MRF101AN devices and a place to start.
https://www.nxp.com/products/rf/rf-power/rf-ism-and-broadcast/1-600-mhz-broadcast-and-ism/mrf101an-rf-essentials-kit:MRF101AN-START-KIT
Look at it this way. Depending on the supplier you can get a kit for the same price that you can get two devices for .

Mike , if you really want to dive in you have or I can provide my contact information again.

<blockquote data-quote="kopcicle" data-source="post: 723326" data-attributes="member: 46722">Not really Mike. I have a 70w MosFet kit arriving on the slow boat where I intend to replace the IRF5xx with the MRF101&#039;s . What you missed in the above boards was their matching network being wholly unsuitable and not modifiable for HF frequencies. Well, not without such modifications that starting from scratch would be easier and cheaper. better would be <a href="https://qrpblog.com/2019/10/a-600w-broadband-hf-amplifier-using-affordable-ldmos-devices/" target="_blank">https://qrpblog.com/2019/10/a-600w-broadband-hf-amplifier-using-affordable-ldmos-devices/</a>At just a bit over 50 cents a watt it&#039;s a bargain. Even adding the low pass filter board it&#039;s still within $1/watt . I&#039;ll repeat that abusing the output side of these devices is not recommended however they will withstand an enormous amount of abuse. Mishandle the input even a little bit and they die. Another option is approaching RFMW or NXP directly for the MRF101 design essentials kit. This gives you a board , a heatsink, two MRF101AN devices and a place to start. <a href="https://www.nxp.com/products/rf/rf-power/rf-ism-and-broadcast/1-600-mhz-broadcast-and-ism/mrf101an-rf-essentials-kit:MRF101AN-START-KIT" target="_blank">https://www.nxp.com/products/rf/rf-power/rf-ism-and-broadcast/1-600-mhz-broadcast-and-ism/mrf101an-rf-essentials-kit:MRF101AN-START-KIT</a>Look at it this way. Depending on the supplier you can get a kit for the same price that you can get two devices for . Mike , if you really want to dive in you have or I can provide my contact information again.</blockquote>

[QUOTE="kopcicle, post: 723326, member: 46722"] Not really Mike. I have a 70w MosFet kit arriving on the slow boat where I intend to replace the IRF5xx with the MRF101's . What you missed in the above boards was their matching network being wholly unsuitable and not modifiable for HF frequencies. Well, not without such modifications that starting from scratch would be easier and cheaper. better would be [URL]https://qrpblog.com/2019/10/a-600w-broadband-hf-amplifier-using-affordable-ldmos-devices/[/URL] At just a bit over 50 cents a watt it's a bargain. Even adding the low pass filter board it's still within $1/watt . I'll repeat that abusing the output side of these devices is not recommended however they will withstand an enormous amount of abuse. Mishandle the input even a little bit and they die. Another option is approaching RFMW or NXP directly for the MRF101 design essentials kit. This gives you a board , a heatsink, two MRF101AN devices and a place to start. [URL]https://www.nxp.com/products/rf/rf-power/rf-ism-and-broadcast/1-600-mhz-broadcast-and-ism/mrf101an-rf-essentials-kit:MRF101AN-START-KIT[/URL] Look at it this way. Depending on the supplier you can get a kit for the same price that you can get two devices for . Mike , if you really want to dive in you have or I can provide my contact information again. [/QUOTE]

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