[hpsdr] Mounting Munin T1 & T2??

[Tim ORourke]

I made thin brass ones for the kits I put together.
Would ship some if you do not have resource.
Tim
-----Original Message-----
>From: John <radio at mediacombb.net>
>Sent: Dec 25, 2013 8:24 AM
>To: Tim O'Rourke <w4yn at earthlink.net>
>Cc: hpsdr at lists.openhpsdr.org
>Subject: Re: [hpsdr] Mounting Munin T1 & T2??
>
>
>Thanks for the offer Tim, but I have the straps that came with the 
>kit.  They do seem pretty thick to bend so that they contact both the 
>top of the transistor flange and the circuit board nicely.  I could 
>make thinner straps out of copper foil and probably bend them or, 
>maybe, buy some copper of the right thickness to fill the void 
>between the top of the heat spreader and the straps I have.
>
>Dick, what I'm trying to say is best described in the mechanical 
>drawing of the RD100HF-1 data sheet available here:
>http://www.mitsubishielectric.com/semiconductors/content/product/hf/sirfpowermosfet/siliconrfdiscrete/siliconrfdiscrete_lv4/rd100hhf1.pdf
>
>The thickness of the flange is 3.3 +/- 0.2 mm but the bottom of the 
>other leads is 4.5 +/- 0.7 mm above the bottom of the flange.  The 
>problem I see is that when I make the four mounting posts for the 
>circuit board so that the drain and gate leads are flush against the 
>pads on top of the board, the top of the flange (source connection) 
>is a considerable distance (nominally 1.2 mm) below the top of the 
>circuit board.  I do not understand how the drawing on page 2 of 
>Mounting the RD100HHF1
>http://www.k9ivb.net/Munin2/Mounting_The_RD100HHF1.pdf
>applies.  That drawing shows the RD100HHF1 flush with both the heat 
>spreader and the top surface of the circuit board.  One of the 
>pictures on your site shows the straps are flat and the other picture 
>shows them bent, but the bent ones don't look as if they are bent 
>enough to reach the top of the flange.
>
>John, WoGN
>
>
>At 03:51 PM 12/24/2013, Tim ORourke wrote:
>>If you refer to wiki munin page you will see brass straps bent to 
>>accmodete the raised mounting tabs. I can send you some straps if 
>>you do not have a way to make them. Tim w4yn
>>
>>
>>
>>
>>-----Original Message-----
>> >From: John <radio at mediacombb.net>
>> >Sent: Dec 24, 2013 4:09 PM
>> >To: bob at llorenzini.com, "hpsdr at lists.openhpsdr.org" 
>> <hpsdr at lists.openhpsdr.org>
>> >Subject: Re: [hpsdr] Mounting Munin T1 & T2??
>> >
>> >***** High Performance Software Defined Radio Discussion List *****
>> >
>> >
>> >Hi Bob,
>> >
>> >I don't think that document applies in my case.  With the transistors
>> >I got with my kit, and with the four board mounting spacers made so
>> >that the tops of the transistor flanges are flush with the top of the
>> >circuit board, the other transistors leads are way above the level of
>> >the top of the board.
>> >
>> >John,  WoGN
>> >
>> >
>> >At 01:35 PM 12/24/2013, Robert Lorenzini wrote:
>> >>On 12/24/2013 11:25 AM, John wrote:
>> >>>***** High Performance Software Defined Radio Discussion List *****
>> >>>
>> >>>
>> >>>
>> >>>Transistors T1 and T2 in my Munin kit are made with the two thin
>> >>>leads a considerable distance above the top of the mounting
>> >>>flange.  When the four corners of the circuit board are spaced so
>> >>>that the two thin transistor leads are flat against the pads on top
>> >>>of the board, there is considerable distance between the bottom of
>> >>>the copper straps and the top of the transistor flange. As
>> >>>transistor hardware is tightened the board starts to bend and the
>> >>>transistor leads lift above the pads on the circuit board.
>> >>>
>> >>>Has anyone else had this problem and, if so, how did you make it work?
>> >>
>> >>Your going to need to make custom spacers.
>> >>
>> >>http://k9ivb.net/munin2/Mounting_The_RD100HHF1.pdf
>> >>
>> >>Bob - wd6dod
>> >
>> >
>
>


Tim O'Rourke 
W4YN at ARRL.Net
Low Power Amateur Radio Rocks 
Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
NHRA Life Member

 1387981991.0