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Topics - gil

Pages: 1 [2] 3 4 ... 23
16
Morse Code / Elecraft K1 Discontinued!
« on: August 31, 2017, 03:52:17 AM »
Sad sad day today as Elecraft removed the K1 from its products line.
I wish they would make a surface-mount version...

 Gil.

17
General Discussion / Crowd Funding The Perfect Survival Radio?
« on: August 22, 2017, 01:51:20 PM »
Hello,

You know I've been thinking about the perfect survival radio for a while, first proposing a CW-only transceiver. Only fools never change their mind, so here is what I have come up with now:
  • Quad band, 20, 30, 40, 80m transceiver.
  • CW and DSB modes.
  • Keyer optional but real CW with full QSK.
  • 3kHz and 400Hz filters.
  • General coverage receiver.
  • 10W output.
  • Low current draw on receive.
  • Watertight case and connectors.
  • Battery in the case.
  • Built-in battery charger (3x 18650?).
  • Military handset or speaker-mic.
  • SWR indicator.
  • High SWR protection.

The choice of DSB is dictated by the need to interoperate with military radios which use USB only. I am thinking of a minimalist concept, less is better.

I wonder if a radio designer could be hired after a crowd funding campaign... What are your thoughts on this?

Gil.

18

Gil.

19
Technical Corner / New QRP Labs 5W CW Transceiver Kit.
« on: August 21, 2017, 07:13:54 AM »
http://qrp-labs.com/qcx.html

Impressive list of features! I have one on order for 80m.



  • Easy to build, single-board design, 10 x 8cm, all controls are board-mounted
  • Professional quality double-sided, through-hole plated, silk-screen printed PCB
  • Choice of single band, 80, 60, 40, 30, 20 or 17m
  • Approximately 3-5W CW output (depending on supply voltage)
  • 7-16V recommended supply voltage
  • Class E power amplifier, transistors run cool… even with no heatsinks
  • 7-element Low Pass Filter ensures regulatory compliance
  • CW envelope shaping to remove key clicks
  • High performance receiver with at least 50dB of unwanted sideband cancellation
  • 200Hz CW filter with no ringing
  • Si5351A Synthesized VFO with rotary encoder tuning
  • 16 x 2 blue backlight LCD screen
  • Iambic keyer or straight key option included in the firmware
  • Simple Digital Signal Processing assisted CW decoder, displayed real-time on-screen
  • On-screen S-meter
  • Full or semi QSK operation using fast solid-state transmit/receive switching
  • Frequency presets, VFO A/B Split operation, RIT, configurable CW Offset
  • Configurable sidetone frequency and volume
  • Connectors: Power, 3.5mm keyer jack, 3.5mm stereo earphone jack, BNC RF output
  • Onboard microswitch can be used as a simple straight Morse key
  • Built-in test signal generator and alignment tools to complete simple set-up adjustments
  • Built-in test equipment: voltmeter, RF power meter, frequency counter, signal generator
  • Beacon mode, supporting automatic CW or WSPR operation
  • GPS interface for reference frequency calibration and time-keeping (for WSPR beacon)

Better hurry on this one guys, there is a limited number available...

Gil.

20
Great read... File attached.

Gil.


21

Gil.

22
Antennas / Polish 8m Light VHF Antenna Mast.
« on: August 08, 2017, 03:04:02 AM »

Gil.

23
Technical Corner / The EA3GCY MFT-40 DSB Transceiver Kit.
« on: July 31, 2017, 02:01:28 PM »

Gil.

24
Antennas / The PAR OA144 2m Omnidirectional Antenna.
« on: July 24, 2017, 01:36:41 PM »

Gil.

25
Antennas / Chameleon P-LOOP 2.0 (with RT-320) Conclusion.
« on: July 09, 2017, 01:50:21 PM »

Gil.

26
VHF and Above / Extend Range With 2m VHF SSB Radio.
« on: July 03, 2017, 03:56:09 PM »

Gil.

27
General Discussion / Book: Modern Practice of The Electric Telegraph.
« on: July 01, 2017, 04:39:37 AM »
Excellent online resource on making batteries and the wired telegraph.

http://www.insulators.info/books/mpet/

Gil.

28
Antennas / Building a Portable 6-el. VHF 2m Yagi-Uda Antenna.
« on: June 28, 2017, 04:15:14 PM »

Gil.

29
Classifieds / SGC SG-2020 on Ebay!
« on: June 25, 2017, 01:29:54 PM »
I am very tempted, but need to be reasonable... Item 292162693806.

Gil.

30
Antennas / Chameleon PLOOP 2.0.
« on: June 23, 2017, 06:50:53 AM »

Gil.

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