[hpsdr] Building a Hercules: a few questions

[Tim O'Rourke]

George
I have the instructions saved somewhere and will look for them tonight.
Gerd has a tin box avaulable but you will need to cut openings, it is a tight fit but works, I may have a spare if he does not have one available.
The diodes in SWR measurement are marginal according to Gerd you need to remove 1 turn from toroid so that you do not over voltage the diodes, have lost mine and need to do this mod myself.
I also thay the verbage that explains display messages and will send that along also.
Tim W4YN


-----Original Message-----
>From: george byrkit <ghbyrkit at chartermi.net>
>Sent: Nov 22, 2010 10:15 AM
>To: hpsdr at lists.openhpsdr.org
>Subject: [hpsdr] Building a Hercules: a few questions
>
>***** High Performance Software Defined Radio Discussion List *****
>
>Dear All,
>
>I'm finishing the build of a partial-kit Hercules that Ed AB8OJ originally
>purchased.  By partial-kit, I mean that all he had to do was wind the
>toroids and mount the toroids and relays (the filter section), for the most
>part.
>
>I've found the instructions for the full-build of the board.  I'd note that
>the one problem that Ed had was that the instructions did NOT discuss at all
>how to properly mount Q3 and Q7, especially with regards to the black nylon
>insulating washer.  Thus, on his board it ended up on the bottom, and thus
>the screws holding Q3 and Q7 caused a direct short from collector of each to
>the heatsink.  I eventually figured this out after removing the PCB from the
>heatsink and checking that the PCB didn't have a short in that condition,
>and that the display board worked (it did.)
>
>Remounted the PCB after checking for shorts from wires on the bottom of the
>PCB.  When I put the screws back in on Q3 and Q7, the problem returned.  I
>put the black nylon bushings/washers on the top of Q3 and Q7 and 'problem
>solved'.  Since none of the instructions describe this clearly, I think that
>they should be amended to describe how to do this properly!
>
>Now, on the bias adjustment phase, one is instructed to set all pots,
>including VR3 and VR5 (fwd and rev power calibration?) to full CCW
>(anti-clockwise) before the bias adjustment process.  There is no mention
>later of the procedure to adjust VR3 and VR5 properly.  What is that
>procedure?  Enquiring minds want to know?
>
>Also, is there any recommended 'mini-box' to use to mount the T/R switch in?
>
>Vy 73,
>George Byrkit, K9TRV
>
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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

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