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July 21, 2018, 11:15:31 AM *
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 on: Today at 06:26:24 AM 
Started by John K5PRO - Last post by VE3ELQ
I don't know the cost of these, but its not gonna be cheap.
DK USA has them at $48.00.  https://www.digikey.com/products/en?keywords=%20MRF300AN
Interesting looking linear FETs, thanks for posting.

73s Nigel

 on: Today at 02:43:41 AM 
Started by John K5PRO - Last post by John K5PRO
Years ago, Advanced Power Technologies in Bend, OR, had a line of plastic transistors that were designed for RF, for class D and E power sources. They had devices with mirror image symmetry so that they could be laid out for Push Pull with the sources adjacent. NXP (was Freescale) just introduced a couple of parts that are characterized for RF with full data, and packaged in TO220 or TO247 like the switchmode transistors used by many for class E here. These are only 50 VDC parts, in LDMOS, rated for 65:1 VSWR at 40 and 230 MHz. The bigger one is 300 Watt CW, 1.8-250 MHz range, the MRF300AN and the matching MRF300BN. I don't know the cost of these, but its not gonna be cheap.

 on: Yesterday at 07:19:38 PM 
Started by WB2PKR - Last post by w3jn
Had the exact thing happen in a NC-303.  Replaced it with a 120/6.3V filament transformer.  It sounded better than the stock xformer.

The impedance of rigs like this is very forgiving.  No need to overthink/overengineer things.

 on: Yesterday at 02:16:10 PM 
Started by VE3ELQ - Last post by WBear2GCR

Hey, look, I was just trying to help.
I've spoken to Nigel on the air, and emailed him in the past.
He's been fine to deal with.

IF he's not responding then there is a good reason.
Perhaps one of them may be that your email gets "eaten" as a SPAM so he doesn't see it?
Or, as I said, he is away.
Or, perhaps he is SK.

Also, this is not a KIT, and this is not a hand-holding, spoon feeding society - although people do try to help.

Regardless, take a pill and calm down.


 on: Yesterday at 02:09:58 PM 
Started by KB2WIG - Last post by WB2EMS
Any modes besides FT8?  I keep seeing spots for activity, and tune down in the sideband and AM frequencies and listen and call and nothing. Dial up to 313 and it's full of stuff. It wouldn't be so bad if you could keyboard to keyboard rag chew, but it's just computers talking to each other. About as interesting as typing 'ping'.


 on: Yesterday at 12:18:06 PM 
Started by KB2WIG - Last post by KB2WIG

Open now in North America and also to Europe.


 on: July 19, 2018, 11:12:31 PM 
Started by WBear2GCR - Last post by DMOD
it's simple.

just write up a doc file of what you did and submit.

It's very informal.

Phil - AC0OB

 on: July 19, 2018, 08:13:56 PM 
Started by WBear2GCR - Last post by WBear2GCR

I would recommend contacting Ray at Ray@ERmag.com and tell him what you have.

He can guide you through the process.

Phil - AC0OB

Ugh! A "process"?
Oh gee, I really have a dislike of going through a "process"!
Is there a way to side-step a process??



 on: July 19, 2018, 05:38:55 PM 
Started by w2amr - Last post by w2amr
Haven't heard Walt in many years. I noticed his license expired July 2015. Has anyone heard from him?

 on: July 19, 2018, 05:34:09 PM 
Started by AF5J - Last post by AF5J
looks like some variable voltage trans and other free stuff

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