[ARC5] First Receiver Drift Test from KE6F

[Fuqua, Bill L]

  Results were pretty impressive. It is interesting that 10 meters was so bad in comparison.
Perhaps they just did not see any need to shoot for stability on 10 meters.
73
Bill wa4lav

________________________________________
From: ARC5 [arc5-bounces at mailman.qth.net] on behalf of Bob via ARC5 [arc5 at mailman.qth.net]
Sent: Sunday, November 29, 2015 12:08 AM
To: arc5 at mailman.qth.net
Subject: [ARC5] First Receiver Drift Test from KE6F

Hi to those folks interested in the drift performance of the old Tube Receiver.  I found it too much of a task to run a bunch of receivers on a concurrent drift test so will be running these one at a time under the same controls I stipulated in my earlier postings


1.      The ambient temperature in the shop during these tests was 62 degrees F.


2.      The signal source Was an Agilent E4400B with an ovenized clock and calibrated against my Rubidiium standard


3.     Before any tests were made the receiver was allowed to warm up for 5 minutes at which time the 80 meter
        test was made;  RECEIVER was National  NC-303 BFO on widest bandwidth 500 uV from signal generator.  Subsequent
        bands were tested at nominal 1 hour intervals.


4.      80 Meters  3.7 MHz zero beat at 3:30 pm  All drift numbers are from the 3.7 MHz reference point
        3:35 pm drift +80 Hz (80 Hz change)
        4:05 pm drift +81 Hz (1 Hz change)
        4:15 pm drift +86 Hz (5 Hz change)
        4:30 pm drift +91 Hz (5 Hz change)


5.      40 Meters 7.150 MH zero beat at 4:31 pm All drift numbers from the 7.150 Reference point
        4:55 pm drift 15 Hz  (15 Hz change)
        5:01 pm drift  28 Hz (11 Hz change)
        5:30 pm drift  00 Hz  (28 Hz change back to zero beat)


6       20 Meters 14.2 MHz  zero beat at 5:32 pm  All drift numbers from the 14.2 MHz reference point
        5:55 pm drift 84 Hz (84 Hz change)
        6:30 pm drift 128 Hz (44 Hz change)


7,      15 Meters 21.250 MHz zero beat at 6:32 pm All drift numbers from the 21.250 MHz reference point
        6:45 pm drift 20 hz (20 Hz change)
        7:00 pm drift 41 Hz (21 Hz change)
        7:15 pm drift 50 Hz (9 Hz change)
        7:32 pm drift 61 Hz (11 Hz change)


8:      10 Meters 28.80 MHz zero beat at 7:35 pm all drift numbers from 28.8 MHz reference point
        8:00 pm drift 420 Hz (420 Hz change)
        8:33 pm drift 590 Hz (170 Hz change)


It would appear that this receiver demonstrated fairly decent stability on all but the 10 meter band and had that test been allowed to continue the 10 meter band would also have been usable as the rate of change was calming down in the last 30 minutes.  Overall mechanical stability is above average but no drop tests were made at this time.    The receiver is in average condition and has been in dry storage for a few years.  No modifications or other work has been done on the unit.  It even has the original filament ballast tube in place.


        Once i get the SX101A up on the bench I will run the same series on that item.  Comments invited on the procedures and results


73   Bob


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