In the recent discussion on the HW-101 VFO, I mentioned notes on how I had got mine working so well. The owner of my radio was nice enough to send back the notes. <div><br></div><div>If it is OK, I'd like to post the notes here first, so that you all can enjoy/try them and comment. I'm certainly going to write to enjoy myself. Anyway, here we go...</div>
<div><br></div><div>-----<br clear="all"><div><br></div><div>As with any big project I am about to begin, I wrote down my strategy so that I had a good chance of success, and to see if I REALLY wanted to do this. Here was mine:</div>
<div><br></div><div>"HW-101 Restoration Strategy"</div>
<div><br></div><div>(I assumed that I'd already done a complete visual inspection and found no major issues. Start with a good rig, it isn't worth it to do this to a rotten one)</div><div><br></div><div>1. Restore 'as-built' functionality</div>
<div>a) Rebuild the HP-23 supply (with PCB kit).</div><div>b) Replace components for safety (two electrolytics in rig)</div><div>c) Test tubes for gross performance issues in emission tester</div><div>d) Connections and controls cleaned and lubed.</div>
<div>e) Follow the manual and schematics; perform all tests, checks and alignment specified</div><div>f) While performing resistance checks, replace out-of-tolerance components with like components</div><div>g) Perform only the most basic modifications and reworks to restore expected performance</div>
<div>h) List all remaining deviations from expected performance.</div><div><br></div><div>2. Apply all applicable Heatkit Technical Bulletins</div><div>a) Determine which TBs are 'applicable', many are conditional.</div>
<div>b) Apply modifications and procedures, one at a time, oldest first (except where an old TB has been superceded by a new one). Retest following each modification (in scope to sections repaired and modified)</div><div>
c) Repeat 1e, and list remaining deviations.</div><div><br></div><div>3. Apply modifications - following technical review</div><div>a) Locate all known good HW-101 modifications (I think RIT sucks).</div><div>b) Evaluate effectiveness, degree of modification, risks</div>
<div>c) Choose modifications, list from lowest risk/effort to highest</div><div>d) Apply modifications, one at a time, then test for effectiveness and possible side-effects.</div><div><br></div><div>4. Deviations</div><div>
a) List remaining deviations</div><div>b) Evaluate costs of developing modifications, limitations of rig design</div><div>c) Choose modifications of low risk/cost/effort.</div><div>d) Apply modifications, one at a time, etc.</div>
<div><br></div><div>---</div><div><br></div><div>So, first, I am a professional engineer, so I hope that explains why I wrote like this. Or I'm mental - that would explain it too. In the end, I followed the plan, and met my goals too. Notice I didn't have a stage 5 - enjoy your new rig. That is a very important stage if you want to justify all that work you put in, unless you are doing it for the fun of it.</div>
<div><br></div><div>What did we learn today: Start with a good looking, good working radio. Plan your trip.</div><div><br></div><div>Next Part - Feng Shui of Radio Restoration</div><div><br></div>-- <br>David Goncalves<br>
</div><div>W1EUJ</div>