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1934 Superhet Receiver #9

Wiring, Smoke Test, Alignment

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The construction process continued with wiring the underside of the chassis.  I acquired NOS lacquered, cloth covered wire in several different gauges.  All components (carbon comp. resistors, caps, etc.) are NOS, mostly 50/60s vintage.  Wide, waxed covered, white dental floss was used for lacing the wire bundles where needed.  In commercial gear with wire harnesses, lacing was generally done first, then the harness installed.  For this one-off homebew project, I just laced the wire bundles in-place after installation. Continue reading 1934 Superhet Receiver #9

NO3M #4 – NCJ North American Sprint – Sept 2016

The preliminary results are posted on the NCJ website for the Fall NCJ Sprint:

Top Ten Scores
Call 	Score	Bnd Chgs Qs Lost 00Z	01Z	02Z	03Z
N9RV	16,368	154	 1	 100	91	76	74
N2IC	16,330	150	 0	 110	85	80	80
N6MJ	15,557	2	 4	 92	88	64	87
NO3M	15,510	144	 4	 116	76	76	62
N6TV	15,134	105	 5	 101	83	70	68
N5KO	15,088	119	 0	 93	89	75	71
N5RZ	15,087	106	 2	 94	89	68	70
K4RO	14,993	126	 4	 99	79	82	59
N4OGW	14,664	108	 0	 103	72	73	64
K0EU	14,628	102	 4	 98	75	76	69

73 until the next Sprint in February! – NO3M

1934 Superhet Receiver #8

Front Panel Embellishments

The final touches on the front panel were installed today.  Dial markers were added just above the BFO, RF gain, and crystal filter phasing control knobs.  The markers were made by filing down the heads of #2-56 screws.  These are similar to the dial markers used on the National HRO series receivers.

Next, an information tag and main tuning calibration chart were added.  The hi-resolution (300dpi) graphics were created in GIMP (GNU Image Manipulation Program).  The calibration charts (160, 80, 40, 20) were modelled after the early HRO style paper charts that were on the plugin coilsets, with a 0.1 in. grid.  In fact, the satin-black metal frames and clear plastic covers (yellowed from age) to mount the information tag and calibration chart were taken from an old HRO coilset.  The frames are held in place with #4-40 black screws.  The front panel has tapped holes to accept the screws.  When changing bands, the calibration chart above the main tuning dial can be changed by removing the top screws and loosening the bottom screws.  The charts can be slide in and out from the top.

The yellowing of the plastic  covers really adds a nostalgic appearance to the receiver.

With all of the front panel work complete, it’s time to start wiring!