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Contact Cormac: w7jhs@embarqmail.com
circa 1959 Updated May 13, 2008
The world of AM radio is alive and well. There are a number of websites that do a fine job of telling the story. This site has recently been linked to a site down south. Check it out! www.california-am.com
W7JHS Shack as of Oct. 31, 2007
The main operating position as of Oct. 31, 2007. The operating position includes 9 receivers and 8 transmitters for AM operation. All are instantly switchable providing 72 different combinations!
On the left is the Echophone EC-1 and Echophone EC-2. Centerpiece transmitters include the Viking Valiant and the Globe Champion 300. The Class D, DYY Junior and the Class D, K7DYY SR transmitters are on the shelf below the switching system. The HQ-140-X is shown beside the Globe Champ.
The main switching system is shown on the top right side of the picture. Hanging below the center shelf on the left is the CW position consisting of the Elecraft K-1 QRP rig and the position for my IC-706 MkIIG when installed.
Moving to the right side of the operating position we see the Ecophone EC-3 receiver with the Viking II CDC transmitter. Just below is the National HRO-7 receiver with matching speaker and doghouse power supply.
On the bottom shelf is the Harvey-Wells Bandmaster TBS-50C and its original power supply can be used barefoot or to drive the LFE Linear. The BC-614E speech amp for the BC-610 is also on the lower shelf.
Shown here is the K7LFE, Little Faint Echo Laboratories Model 8 Linear Amp with a pair of 813's in Grounded Grid for AM & SSB operation.
Packaged in a homebrew wooden rack, the amplifier runs around 1KW PEP with either the Kenwood TS-520SE or TS-530S drivers and 350 watts of carrier when driven by the TBS-50C.
Also shown is an SB-610 monitor scope for the linear and a Beckman scope hooked up to the R-390A i.f. for receive monitoring. A 2900 volt power supply for the linear amplifer is below.
The wooden receiver rack houses the SX-111, R-390A, SX-101A and
BC-342N. The BC-610 with outboard modulation reactor system on top is shown on the right.
Class D - AM Transmitters
Designed and built by Bruce, K7DYY, the Class D AM transmitter, the DYY, JR is Serial #1 of the production models. Completely self contained, RF power is developed from line voltage. Conservatively operated at 150-180 watts output, the unit gives full modulation when used with the companion K7DYY audio processor built into the base of the D-104 microphone.
The larger unit is the K7DYY, SR runs easily at 350 watts of carrier. It is Serial #1 of the production run. Features of the new design include 6 pre-set frequencies, a spotting switch, built in T-R relay and hard contacts for muting purposes.
For more info visit Bruce's web site www.k7dyy.com
See Ham Shacks #1, #2 & #3 pages for 3870 AM gang photos.
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