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WA2FTV

Joined: Sat, Mar 3rd 2012, 03:12 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
Pad Diameter for Components on a PCB Jul 15th, 22:02 2 422 on 30/7/19
Deluxe Memory Keyer with 3072-bit Campacity Jun 4th, 12:03 1 625 on 4/6/19
Strategies for 5BWAS May 28th, 15:53 1 683 on 28/5/19
IC DIP Sockets - Gold Plated vs Tin Plated Dec 12th 2018, 06:11 3 1,109 on 20/12/18
Pure Sine Wave Inverter with low/no EMI Oct 2nd 2018, 12:38 2 1,423 1 week, 2 days ago
Sheet Metal Fabricator for HAM Projects Jan 13th 2018, 12:09 5 2,380 on 2/6/19
Accu-Keyer and Accu-Memory Boards or Artwork Nov 26th 2017, 18:07 5 3,149 on 9/12/18
450Ω vs 600Ω ladder linr to feed loop antenna using 4:1 Balun Apr 17th 2017, 18:36 2 1,479 on 21/4/17
QSL Organizer - MIL Industries - Panorama City, CA - In Business? Jun 24th 2016, 11:43 2 1,314 on 24/6/16
High Minimum SWR (2.5 - 3.0) on 20m Apr 3rd 2016, 10:53 5 1,427 on 6/5/16

Latest Posts

Topic Author Posted On
Pad Diameter for Components on a PCB WA2FTV on 15/7/19
Hello,

I am designing a circuit board layout. This is my first attempt.

I have a question with regard to pad hole size for a component (such as a capacitor or resistor).

How much larger than the lead diameter of the component (ex. capacitor) should the pad on the circuit board be?

If for example, the lead diameter is .033 inch in diameter, is a hole size of .035 inch enough or should it be larger?

Thank You and 73's

Cedric
WA2FTV
Deluxe Memory Keyer with 3072-bit Campacity WA2FTV on 4/6/19
Greetings Everybody,

I am wondering if someone could provide some input/help. The following article is an improvement of the famous James Garrett WB4VVF Accu-Keyer. It was written by Robert Cheek (W3VT) in the April 1979 issue of Ham Radio magazine on pages 32-43. The call sign W3VT appears to be a vanity call sign that is assigned to someone else, not Robert C Cheek.

I can get parts from second source suppliers.

I would like to duplicate the keyer portion of this design without the memory portion. The original James Garrett design used two transistors to generate the clock pulses. The W3VT design uses a 555 timer that is located on the memory board. There are two clock signals (CLOCK IN and CLOCK CONTROL).

Does anyone have an idea of how to handle (where to connect) the CLOCK CONTROL signal that originates from the output of a 74123 through a diode on the memory board? The CLOCK IN signal is the output of the 555 on the memory board through an inverter. The CLOCK CONTROL is an output from a 74123 IC on the memory board through a diode. The 74123 is a Retriggerable Monostable Multivibrator.

https://www.americanradiohistory.com/Archive-DX/Ham Radio/70s/Ham-Radio-197904.pdf

Any advice would certainly be appreciated.

Thank You and 73s,

Cedric
Amateur Callsign WA2FTV
Amateur Extra
Strategies for 5BWAS WA2FTV on 28/5/19
Greetings Everybody,

Having recently completed my WAS in October, 2018, I would like to try for the 5BWAS.

Since I reside in an apartment, I camped at a local state park and participated in the QSO Party for the state I needed. In my case, it was SD that I needed, so I camped that week-end at the state park an participated in the QSO Party. I used my base rig with an MFJ-1979 collapsible whip antenna and a Wolf River Coils SB-1000 adjustable loading coil below the antenna. This combination was magnetic mounted to the roof of my mini van.

I was wondering what types of strategies other amateur radio operators use for the 5BWAS in addition to participating in the various QSO Parties.

Please share your thoughts and ideas.

Much appreciated.

73's

Cedric
FCC Call Sign WA2FTV
Amateur Extra
IC DIP Sockets - Gold Plated vs Tin Plated WA2FTV on 12/12/18
Hello Everybody,

Does anyone here on the forum know if there are any advantages of using gold plated IC Sockets over tin plated IC sockets for soldering into a through-hole technology circuit board to justify the extra cost (2X) of the gold plated sockets?

I am rebuilding a vintage keyer with an updated circuit board and do not know if I should purchased gold plated or tin plated IC sockets.

Regarding the IC sockets, I am referring to the pins of the socket that are soldered into the circuit board.

Thank You for your assistance and 73's

Cedric
WA2FTV
Pure Sine Wave Inverter with low/no EMI WA2FTV on 2/10/18
Hello Everybody,

I am thinking about purchasing a pure sine wave inverter.

Does any body know of who manufactures a quality unit that is quiet EMI/RFI wise?

I am thinking of 1000W - 3000W range.

Thank You and 73's

Cedric
WA2FTV

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