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WA2FTV

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Latest Topics

Topic Created Posts Views Last Activity
Any reason to have a Serial Port on a new Computer? Feb 21st, 11:05 2 52 1 week ago
Ideas for an Antenna in an Apartment with Aluminum Siding Feb 1st, 14:48 2 144 3 weeks, 5 days ago
Circuit Board Design Questions Jan 11th, 19:24 1 228 on 11/1/20
Pad Diameter for Components on a PCB Jul 15th 2019, 22:02 2 929 on 30/7/19
Deluxe Memory Keyer with 3072-bit Campacity Jun 4th 2019, 12:03 1 1,243 on 4/6/19
Strategies for 5BWAS May 28th 2019, 15:53 2 1,347 on 23/12/19
IC DIP Sockets - Gold Plated vs Tin Plated Dec 12th 2018, 06:11 3 1,553 on 20/12/18
Pure Sine Wave Inverter with low/no EMI Oct 2nd 2018, 12:38 4 1,971 on 22/10/19
Sheet Metal Fabricator for HAM Projects Jan 13th 2018, 12:09 7 2,910 3 weeks ago
Accu-Keyer and Accu-Memory Boards or Artwork Nov 26th 2017, 18:07 5 3,795 on 9/12/18

Latest Posts

Topic Author Posted On
Any reason to have a Serial Port on a new Computer? WA2FTV 1 week ago
Hello Everybody,

I am in the process of purchasing a new computer.

I am wondering everybody's opinion if I should request a serial port. The computer with have USB ports.

Thank You for your input in advance.

Best Regards and 73's,

Cedric
WA2FTV
Ideas for an Antenna in an Apartment with Aluminum Siding WA2FTV 3 weeks, 6 days ago
Hello Everybody,

I am wondering if anybody has any ideas of what I can do to get on the air (HF).

I reside in a first floor apartment that has Aluminum siding, so the apartment is basically a Farady cage.

There is a balcony on the north side of the apartment. It has a wall about 5 feet high that faces North. The ceiling is about 8 feet high. The area of the balcony measures about 11 ft x 5 ft.

I have a vertical on the balcony. It consists of an MFJ-1979 collapsible 17 ft antenna plus a Wolf River Coils SB-1000 adjustable loading coil.

Any ideas or suggestions would be welcomed.

Thank You in advance

Best Regards and 73's

Cedric
WA2FTV

With this connected to the radio, I do not hear any signals. I think I might be hearing something in the noise, but I am not sure.

Residing in the Denver, CO area, I cannot pick up WWV. Being so close, I would think that I should at least pick this up, but I do not.
Circuit Board Design Questions WA2FTV on 11/1/20
Hello Everybody,

If there is anybody that has done circuit board design (either professionally or as an amateur), I have a few questions regarding the design. This is my very first attempt at designing a circuit board assembly for a ham radio application.

I am using one of the free shareware circuit board design SW to design a receive only switchable attenuater along with a Low Pass Filter, 50:75 ohms impedance transformer. I purchased a pre-amp that will be part of the system. It will be part of a Hula Loop antennas system.

My questions are the following...

1) What width is commonly used for the traces? The system default appears to be .010 inch. Does it need to be wider?

2) Do my traces need to be at 45 degree intervals when changing direction verses 90 degree intervals?

3) If I were to have components on both sides of the board (i.e. SMT devices), what size via feedthrough hole size would be appropriate?

4) For THT (Through Hole Technology) parts, how much larger in diameter should the hole pad be compared to the lead diameter (Ex: 10% larger)?

Thank You for your assistance.

Best Regards and 73s,

Cedric
WA2FTV
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

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