Warning: Creating default object from empty value in /homepages/11/d132647312/htdocs/Amfone/mkportal/include/SMF/smf_out.php on line 47
ISO: MRF240A




 
The AM Forum
August 07, 2020, 04:59:12 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: ISO: MRF240A  (Read 792 times)
0 Members and 1 Guest are viewing this topic.
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« on: July 01, 2020, 11:15:02 AM »

It's a long shot, but no harm in asking
Just discovered that my 160W VHF amp has a bad driver transistor. RF Parts no longer carries it and MFJ who purchased Mirage says its "too old". EBAY has a few listed, but all from China. and likely to be knock-offs. Anyone happen to have an MRF240A in their parts box, or know of any place that has one?
Logged
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2212


Making AM GREAT Again!


« Reply #1 on: July 01, 2020, 02:59:19 PM »

Mouser.com  66 bucks.

https://www.mouser.com/ProductDetail/Advanced-Semiconductor-Inc/MRF240A?qs=%2Fha2pyFaduh5U9W4jr2%2FG4hfJbK2dyR3%252Bx95gqamUx4%3D

FYI, it's an ASI branded device. 

--Shane
KD6VXI
Logged
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« Reply #2 on: July 01, 2020, 07:08:57 PM »

I called Mouser before posting. They told me itís a ď240Ē, not the ďAĒ version. Going to call them back and ask about whatís on your web page. Thanks
Logged
KF7WWW
Member

Offline Offline

Posts: 78


« Reply #3 on: July 01, 2020, 08:58:00 PM »

What does the A suffix designate? Looks like a typical flange mount transistor. I know some of the A suffixís designated stud mount type. Are the data sheets incomplete that I found? I have a bunch of Motorola repeater amp transistors in the shop. Iíll see what I have tomorrow.
Logged
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« Reply #4 on: July 02, 2020, 07:59:09 PM »

Thanks
Iím going to see if I can get both spec sheets to compare.
The 240s seem to be available but the A version isnít.
Logged
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2212


Making AM GREAT Again!


« Reply #5 on: July 02, 2020, 08:48:16 PM »

The 240 is a stud mount, the A is not.

Odd, as that's backwards of most Motorola numbering.

--Shane
KD6VXI
Logged
KF7WWW
Member

Offline Offline

Posts: 78


« Reply #6 on: July 03, 2020, 12:00:52 AM »

I have some ď house numbered ď devices that may be the part your looking for... Iíll get some pictures tomorrow.
Logged
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« Reply #7 on: July 03, 2020, 11:46:36 AM »

Thanks.
Are these 240a or an equivalent device?
Logged
KF7WWW
Member

Offline Offline

Posts: 78


« Reply #8 on: July 04, 2020, 12:53:09 PM »

The parts I have are the m1132, m1133, m1134. From the micor series repeaters..
I think that the 1134 is the same as the mrf240. Maybe someone else can confirm that?
Logged
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« Reply #9 on: July 04, 2020, 04:16:48 PM »

Let me see if I can find some info. Iím sure there are other devices that could be adapted, but I do t have the expertise to start modifying the design to use another device.
Logged
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« Reply #10 on: July 04, 2020, 07:13:54 PM »

I called them- been back ordered, with no estimated delivery.

Logged
W1NB
Member

Offline Offline

Posts: 35


« Reply #11 on: July 04, 2020, 08:04:40 PM »

FWIW, there are several MRF-240As available on eBay.
Logged
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 7763


CQ CQ CONTEST


WWW
« Reply #12 on: July 05, 2020, 12:34:21 AM »

FWIW, there are several MRF-240As available on eBay.

See initial post. Thinks it might be a Chinese knockoff. I'd pick one of these vendors that offers free shipping, returns,  good feedback rating, and is a long time ebay member. If doesn't work or makes the smoke rise, you always have the option to take your frustration to ebay and/or paypal.
Logged

Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« Reply #13 on: July 06, 2020, 08:56:51 AM »

Not going to even consider EBAY. Too many counterfeit devices, and the time required to change the part is not worth the frustration. Tried to research the Motorola devices mentioned earlier but found several mentions that spec sheets area seldom available. I have one other idea that Iíll be following up on today. If it pans out Iíll share the plan.
Logged
Detroit47
Member

Offline Offline

Posts: 522


N8QPC on your AM dial


« Reply #14 on: July 06, 2020, 01:10:04 PM »

Her is the spec sheet if you want the curves say so.

John N8QPC


* img020.jpg (922.83 KB, 2550x3300 - viewed 26 times.)
Logged

"We are all born ignorant, but one must work hard to remain stupid."  Benjamin Franklin
Detroit47
Member

Offline Offline

Posts: 522


N8QPC on your AM dial


« Reply #15 on: July 06, 2020, 01:11:00 PM »

more


* img019.jpg (664.66 KB, 2550x3300 - viewed 29 times.)
Logged

"We are all born ignorant, but one must work hard to remain stupid."  Benjamin Franklin
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 7763


CQ CQ CONTEST


WWW
« Reply #16 on: July 06, 2020, 01:27:00 PM »

Tried to research the Motorola devices mentioned earlier but found several mentions that spec sheets area seldom available.

Not sure where you're looking for spec sheets, but a quick Google found the Motorola stuff:
https://www.datasheets360.com/pdf/3640766398462686885
Logged

Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 820


« Reply #17 on: July 06, 2020, 09:37:39 PM »

These I have.i was looking for the house numbered devices - m1134
Saw several posts that Motorola did not release spec sheets
Logged
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 7763


CQ CQ CONTEST


WWW
« Reply #18 on: July 06, 2020, 11:44:33 PM »

These I have.i was looking for the house numbered devices - m1134
Saw several posts that Motorola did not release spec sheets
Not sure why they would. House numbered devices can generally be procured only from the house that labeled them.
i.e. "keep your customers close"  Cheesy
Logged

Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.064 seconds with 19 queries.