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Saturday, February 1, 2020

SolderSmoke Podcast #217 -- Beach trip, '30s station, uBITX mods, HRO RX AM, ELMAC, Teensy, MAILBAG

Bill's Bavaro DR Beach Station
uBITX in the box, HB key
SolderSmoke Podcast #217 is available: 

1 February 2020

Travelogue!  Dominican Republic trip.  uBITX on the Beach.  EFHW.  LiPo Battery.  First contact of the new year. 

Bill's Bench Report
Following up on proposed uBITX mods: 
-- Put pot on sidetone line from Raduino to keep the sidetone a bit quieter. 
-- Fixed the key -- pounding brass
-- Will install 4 States QRP Active AF filter. 
-- Need to reduce power on CW to 5W
-- Stereo to mono headphone adapters. 
-- Turning off display and mic amp circuit not really worth it -- they don't pull much current. 

Pete's Bench Report: 
ELMAC Power Supply project 
1930s era transmitter? 
Teensy and SDR
KWM-2 suggestions

Back to Bill's Bench:
Working on HRO-ish Receiver. 
Bad SBL-1  
Got idea for wider ceramic filter from Paul VK3HN
Ordered parts from Mini-kits in Australia.  They sent 6kc filters. 
Bruce KK0S sent me some 10 kc filters too. 
Installed 6 kc filter with L network matching networks.  Works great. 
Also installed Infinite Impedance Detector that Paul used. 
Needed some additional amplification ahead of the IID, so I used one stage of BITX amp. 
Works great. I can tune full 40 meter band AND 49 meter SW band.  Radio Romania, China, Radio Marti, Brazil, South Carolina. 
Beefed up the shielding to cut down on AM detection. 

-- AM and DSB in LTSpice
Kanji YC3KNJ's QRPesso Expresso Coffee in the field
-- The DANGERS of powerful magnets. 

--KK4DAS Dean doing great things.   MMM heard at Penn State.  Where is the rest of the CBLA?
-- Thanks to Don for kind donation to the SolderSmoke cause
-- Dale BA4TB -- First SolderSmoke feedback from China.  Thanks Dale!  
--Steve Silverman:  Sideswipers and bugs were made to handle "carpal tunnel of the day"  So do I need a keyer for casual CW work? 
-- Peter VK8VWA on the limited knowledge gained from kit building. Listens to podcast while walking on the beach in Australia. 
-- Allan Hale -- Clothes Pins as Toroid holders.  Yes!  More Clothes Pins   Wild Woody Keys from Dave Ingram 
-- Pete WB9FLW  100 Watt Amp from WA2EUJ  
-- Dave Wilcox K8WPE   A medical question:  Does the Michigan Mighty Mite work differently depending on what kind of medicine was in the pill bottles used for the coil form?  Good question Doc!   Dave suggest that putting CBD on the coil or the crystals.   Anything to mellow out the ham bands... 

Pete's Plank SDR
When you know stuff, you can do stuff!


  1. Bill,
    I've built a couple of the 4sqrp HiPerMite AF filters. There's a separate link on their HiPerMite site that leads to an excel sheet to recompute several resistor values if you want a centre frequency other than the standard 700Hz; I've used 600Hz.

    Also, in one of my "early" kits purchase four or five years ago the two 220uF electrolytic were a very tight fit - they were against each other even when the leads were bent to get them fit the board holes. Order some with a smaller diametre from Mouser to fit the existing holes. Hopefully, they've got the small problem fixed by now.

    They do work very nicely for a CW filter in either a DCR or superset with a wider filter.

    73 Walt K3ASW

  2. Bill
    Do you have the model no for the LipO battery please. I can't find it in the notes.
    Mike G4KXQ

    1. Here you go:

  3. Hello guys - this is a great forum. THANK YOU Bill... my first time browsing through here and I see a lot of great discussions that you would be hard pressed to find on most other forums. Hats off to Bill and his merry band of assistants who have mnade this great resource possible!


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