Hamvention 2010 Drake Forum Slide Presentation Part Two of Three
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1 Hamvention 2010 Drake Forum Slide Presentation Part Two of Three
2 AC-4r Upgrade Michael Bryce Flea Market Space #
3 Drake L7R Power Supply Board AC-4r Upgrade Michael Bryce Flea Market Space #
4 Tony Mills, KF8MW,
5
6 Jeff Weinberg W8CQ HAMVENTION BOOTH 2208, 2209, & 2210
7 Jeff Weinberg W8CQ HAMVENTION BOOTH , 2209, & 2210 M.V.G. May 2010
8 UKA-2 Universal Keying Adapter Inside Booth No. BA0482 MK- 1 Master Keyer Low Power Iambic Keyer Kit
9 Other resources documented on WB4HFN.COM K4QU - TR-7 End Caps, Outside space #3421 KC9YS - TR-4 Knobs and Inserts, Space #2328,2329 & 2330 W2ENY - Drake Web Page Charlie Talbott TR-4 Main tuning knob inserts
10 Tips and Tricks
11 Adapting the L4B linear to modern rigs, plus some cosmetics Why you might not want to use the L4B with modern transcievers Relay's 27 vdc open circuit might be too much The need to sink 55 ma for the relay might be too much Inductive spikes are over and above steady state conditions RF feedback is sometimes problematic Ground loops might be created Vintage, boatanchor, vacuum tube gear is more robust
12 But there is hope Harbach Electronics has a soft-key module The Heathkit Shop has an AmpKeyer HamGadgets has an interface (UKA-2) Other interfaces available? You can homebrew an interface With so many choices, what do I want?!
13 My requirements: Internal, permanent installation in my L4B Hardwired, no connectors, reversible installation Hidden, thus no visual indicators needed No external switches No external power source to be added Optically isolated to minimize RF and ground problems Inexpensive Simple, easy to build and repair And the winner is...door #3...
14 Actually, there are no losers in that list! I selected the UKA-2 since we haven't treated it in previous Forums and venues.
15 What you get versus what you need Plus VOX adaptor plate from "The Man", TR-7 Dude, John Kriner Plus a source of power (aka Nadda Problem)
16 What you don't need from the UKA-2 installed in the L4B All RCA phono connectors R1, 470 ohm resistor; substitute a 180 ohm resistor R3, 10K resistor R4, 220 ohm resistor LED1, LED Q1, 2N7000 MOSFET
17 How do you proceed? Assemble the UKA-2 (ground circuit is important) Install the regulator circuit in the L4B Remove the 2 pin VOX plug Attach the UKA-2 to the VOX adaptor plate and install Wire the UKA-2 to the power source and relay circuits Test Enjoy your L4B with virtually any rig
18 Regulator Circuit for Power Source
19 A picture is worth a thousand words (Hey, who put those connectors in there?)
20 Original 2 Pin VOX Connector (internal view)
21 UKA-2 Mounted to Adaptor Plate
22 Board Installation
23 External View
24 Regulator Circuit for Power Source Terminal strip 100 ma fuse 750 ohm 3 watt resistor 1N5346BG, 9.1 volt Zener diode, 5 watt, 5%
25 Thermistors in the primary of the filament transformer (Not part of interface circuit!)
26 Top View of Completed Installation
27 Cosmetics: A Problem and a Solution
28 Completed Installation (Notice asymmetry from side to side.)
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LDG TW-1 Talking Wattmeter LDG Electronics 1445 Parran Road, PO Box 48 St. Leonard MD 20685-2903 USA Phone: 410-586-2177 Fax: 410-586-8475 ldg@ldgelectronics.com www.ldgelectronics.com 1 LDG TW-1 Talking
SPA1000 kit Power Amplifier kit - Assembly Guide
SPA1000 kit Power Amplifier kit - Assembly Guide Features 2 x 380W at 8 Ω 2 x 680W at 4 Ω 1600W (2Ω) burst power one channel! 2 ohms stable Soft Start circuit with mute control Applications High Power
DX Connection. QSK 2500 Instruction Manual. 1) Description. 2) Specifications.
DX Connection QSK 2500 Instruction Manual 1) Description The DX Connection QSK 2500 allows operating a non-qsk amplifier in QSK mode with no amplifier modifications. No amplifier T/R relay interface is
ALS-1306 Vacuum relay modification
ALS-1306 Vacuum relay modification This modification installs two vacuum relays in the amplifier to allow nearly silent QSK operation. NG7M first did the modification to his ALS-1300 with input from Tom,
Model 901 HEADPHONE AMPLIFIER OWNERS MANUAL. PO Box 204 Boulder, CO tel: fax:
Model 901 HEADPHONE AMPLIFIER OWNERS MANUAL PO Box 204 Boulder, CO 80306 tel: 303.443.7454 fax: 303.444.4634 email: info@gracedesign.com web: www.gracedesign.com Revision A November, 2001 Copyright 2001,
HF SIGNALS ΜBITX. The QRP HF General Coverage Transceiver you can build. Buy Now Circuit Description Wireup Tune Up Help and Support BITX Hacks
Page 1 of 5 HF SIGNALS ΜBITX The QRP HF General Coverage Transceiver you can build Buy Now Circuit Description Wireup Tune Up Help and Support BITX Hacks ($109 USD) Page 2 of 5 The µbitx is a general coverage
Agilent 8761A/B Microwave Switches
Agilent 8761A/B Microwave Switches Technical Overview Product Description The Agilent Technologies 8761A and 8761B are single-pole, double-throw coaxial switches with excellent electrical and mechanical
TENTATIVE PP225D120. POW-R-PAK TM 225A / 1200V Half Bridge IGBT Assembly. Description:
Description: The Powerex is a configurable IGBT based power assembly that may be used as a converter, chopper, half or full bridge, or three phase inverter for motor control, power supply, UPS or other