ISS repeater is on

ISS 437.800 MHz cross band FM repeater activated

International Space Station - Image Credit NASA

International Space Station – Image Credit NASA

At 01:02 GMT on September 2 a cross band FM amateur radio repeater with a downlink on 437.800 MHz was activated on the International Space Statio.

The Amateur Radio on the International Space Station (ARISS) announcement reads:

The ARISS team is pleased to announce that set up and installation of the first element of our next generation radio system was completed and amateur radio operations with it are now underway. This first element, dubbed the InterOperable Radio System (IORS), was installed in the International Space Station Columbus module. The IORS replaces the Ericsson radio system and packet module that were originally certified for spaceflight on July 26, 2000.

Amateur Radio on the International Space Station (ARISS) logoInitial operation of the new radio system is in FM cross band repeater mode using an uplink frequency of 145.990 MHz with an access tone [CTCSS] of 67 Hz and a downlink frequency of 437.800 MHz. System activation was first observed at 01:02 UTC on September 2. Special operations will continue to be announced.

The IORS was launched from Kennedy Space Center on March 6, 2020 on board the SpaceX CRS-20 resupply mission. It consists of a special, space-modified JVC Kenwood D710GA transceiver, an ARISS developed multi-voltage power supply and interconnecting cables. The design, development, fabrication, testing, and launch of the first IORS was an incredible five-year engineering achievement accomplished by the ARISS hardware volunteer team. It will enable new, exciting capabilities for ham radio operators, students, and the general public. Capabilities include a higher power radio, voice repeater, digital packet radio (APRS) capabilities and a Kenwood VC-H1 slow scan television (SSTV) system.

A second IORS undergoes flight certification and will be launched later for installation in the Russian Service module. This second system enables dual, simultaneous operations, (e.g. voice repeater and APRS packet), providing diverse opportunities for radio amateurs. It also provides on-orbit redundancy to ensure continuous operations in the event of an IORS component failure.

Next-gen development efforts continue. For the IORS, parts are being procured and a total of ten systems are being fabricated to support flight, additional flight spares, ground testing and astronaut training. Follow-on next generation radio system elements include an L-band repeater uplink capability, currently in development, and a flight Raspberry-Pi, dubbed “ARISS-Pi,” that is just beginning the design phase. The ARISS-Pi promises operations autonomy and enhanced SSTV operations.

ARISS is run almost entirely by volunteers, and with the help of generous contributions from ARISS sponsors and individuals. Donations to the ARISS program for next generation hardware developments, operations, education, and administration are welcome — please go to https://www.ariss.org/donate.html to contribute to these efforts.

Icom IC-705 QRP radio

 

 

Specifications

General
Frequency coverage (Unit: MHz)
  Receiver 0.030–199.999*
400.000–470.000*
  Transmitter 1.800–1.999
3.500–3.999
5.255–5.405*
7.000–7.300
10.100–10.150
14.000–14.350
18.068–18.168
21.000–21.450
24.890–24.990
28.000–29.700
50.000–54.000
144.000–148.000
430.000–450.000
Mode USB, LSB, CW, RTTY, AM, DV, FM, WFM (Rx only)
No. of memory channels Memory channels: 500 channels (100 groups)

Scan edges: 25 channels

Call channels: 4 channels (2 channels × 2 bands)

Antenna connector BNC connector (50Ω)(One connector for all bands)
Power supply requirement 13.8 V DC ±15% (with external power supply)

7.4 V DC (with BP-272)

Operating temp. range –10°C to +60°C; +14°F to +140°F
Frequency stability Less than ± 0.5 ppm

(–10°C to +60°C; 14°F to 140°F)

Frequency resolution 1 Hz
Current drain
Tx (Max. power)
RX (Max. audio)
RX (Standby)
13.8 V DC
Less than 3 A (10 W)
0.5 A (typ.)
0.3 A (typ.)
7.4 V DC
Less than 2.5 A (5 W)
0.8 mA (typ.)
0.5 mA (typ.)
Dimensions 200×83.5×82 mm; 7.9×3.3×3.2 in (W×H×D, projections not included)
Weight 1.1 kg; 2.4 lb (approx.; including BP-272)

* Some frequency bands are not guaranteed.

Transmitter
Output Power
SSB/CW/RTTY/FM/DV
AM
13.8 V DC
0.1 to 10 W
0.025 to 2.5 W
7.4 V DC
0.1 to 5 W
0.25 to 1.25 W
Modulation system SSB : Digital PSN modulation

AM : Digital low power modulation

FM : Digital phase modulation

DV : GMSK digital phase modulation

Spurious emissions Less than −50 dB (HF)

Less than −60 dB (50 MHz)

Less than −60 dB (144/430 MHz)

Carrier suppression More than 50 dB
Unwanted sideband More than 50 dB
Receiver
Receiver system
0.030 to 24.999 MHz
25.000 MHz and above
RF Direct Sampling
Down Conversion IF Sampling
Intermediate frequencies 25.000 MHz and above:38.85 MHz±0.5 MHz
Sensitivity
(HF: Preamp-1 ON,
50 MHz: Preamp-2 ON,
144/430/440 MHz: Preamp ON)
0.500 to 1.799 MHz 1.800 to 29.999 MHz 50 MHz to 54 MHz 144/430/440 MHz
  SSB/CW(10 dB S/N) 0.20 µV 0.15 µV 0.11 µV
  AM(10 dB S/N) 13.0 µV 2.0 µV 1.0 µV 1.0 µV
  FM (12 dB SINAD) 0.5 µV
(28.000 to
29.700 MHz)
0.25 µV 0.18 µV
  DV (1% BER) (PN9) 1.0 µV
(28.000 to
29.700 MHz)
0.63 µV 0.35 µV
Selectivity (Filter: SHARP)
SSB(BW=2.4 kHz)
CW(BW=500 Hz)
RTTY(BW=500 Hz)
AM(BW=6 kHz)
FM(BW=15 kHz)
DV(12.5 kHz spacing)
More than 2.4 kHz/-6 dB / Less than 3.4 kHz/-40 dB
More than 500 Hz/-6 dB / Less than 700 Hz/-40 dB
More than 500 Hz/-6 dB / Less than 800 Hz/-40 dB
More than 6.0 kHz/-6 dB / Less than 10 kHz/-40 dB
More than 12.0 kHz/-6 dB / Less than 22 kHz/-40 dB
Less than -50 dB
Spurious and image rejection ratio
(SSB/CW/AM/FM)
HF
50 MHz
144 MHz
430 MHz
More than 70 dB* (except for ADC aliasing)
More than 70 dB*
More than 65 dB
More than 54 dB
*At intermediate frequency in -25–30 MHz or 50–54 MHz: More than 50 dB
Audio output power
Internal SP
External SP
More than 530 mW (12Ω load at 10% distortion)
More than 200 mW (8Ω load at 10% distortion)

Supplied Accessories

  • HM-243 Speaker-microphone
  • BP-272 Battery pack
  • OPC-2421 DC power cable

 

 

Lab599 TX-500 QRP radio

 

Download The Product Manual Here:

The Discovery TX-500 Has Received FCC Certification!

The Discovery TX-500 is an ultra compact all-mode transceiver ideal for travelling and portable use.

It’s compact size and light weight means that you can take this radio with you to remarkable places while creating unforgettable experiences.

The strong case offers protection against moisture and dust, ensuring the use of TX-500 in extreme conditions. While a sharp monochrome display will allow you to clearly see the information in either bright sunshine or low light, thanks to a multi-mode backlight.

The transceiver parameters and functions will also make it possible to successfully use the unit at a Home Station or in a Mobile/Portable Environment.

Record-low current consumption in reception mode (up to 110 mA) will extend the battery life, providing the user with longer operating time between charges.

Because the TX-500 is a software-defined radio (SDR), you can expand its capabilities using computer applications. New features will be added with free firmware updates.

The TX-500 Discovery has an integrated high-performance spectrum analyzer, allowing you to see signals before you hear them.

GENERAL FEATURES:

  • 160-6-meter ham bands
  • General ‘receive’ coverage 0.5 – 56.0 MHz
  • All modes: SSB, CW, DIG, AM, FM
  • High-performance 32-bit floating-point DSP
  • Current drain as low as 100 mA in ‘receive’ mode (backlight on, preamp off, no signal)
  • External power supply DC 9-15V, 1 to 2.5A typical in transmit
  • High-contrast LCD with 256*128 px
  • High-performance real-time pan-adapter (48 kHz wide)
  • On-line firmware updates
  • Tilted feet (rear), fold up for transportation
  • Ultra-Compact Size: (H*W*D): 90 mm (3.5″) * 207 mm (8.1″) * 21 mm (0.8″)
  • Weight: 0.55 Kg (19.4 oz)


RECEIVER (
*):

  • Sensitivity (MDS) -136 dBm (typ. with preamp on)
  • Quadrature down-sampling mixer compatible with PC-based SDR (Software Defined Radio) Applications
  • Receiver I / Q outputs for PC soundcard
  • Switchable low-noise preamp and attenuator
  • 3-band receive audio equalizer
  • 4 adjustable digital filters
  • Automatic notch filtering
  • Adjustable noise reduction and noise blanking
  • Audio Output ext. speaker, 3W typ.


TRANSMITTER (*):

  • Adjustable output, 1 to 10W PEP
  • Rugged, SWR and temperature-protected final amplifier stage
  • Carrier Suppression > 50 dB typ.
  • Harmonic / Spurious Outputs > 50 dB below carrier
  • CW Sidetone/Transmit offset 400-1200 Hz, adjustable
  • Speaker-microphone with PTT
  • 3-band microphone audio equalizer
  • 2 adjustable digital filters
  • DSP RF speech processing for excellent ‘punch’

* Specifications apply only within ham bands except as noted. All measurements taken with 13.8 VDC supply.


OTHER FEATURES:

  • Internal CW keyer with 10-300 CPM range
  • 100 general-purpose memories store VFOs, modes, etc.
  • Computer control via USB
  • Full remote-control command set (with kenwood emulates)
  • One-click online firmware upgrades (with free PC software)


PACKAGE INCLUDES THE FOLLOWING ACCESSORIES:

  1. Speaker-microphone
  2. CAT cable for on-line software update
  3. Power cabel for external power source DC 9-15V (battery not included)
  4. Headset and mic adapter with PTT (3.5 mm jack)
  5. CW adapter (3.5 mm jack)

 

Manufacturer’s Website

 

 

Update Technician Privileges in a Digital World

ARRL Reply Comments Stress Need to Update Technician Privileges in a Digital World

05/01/2019In reply comments to the FCC (comments on comments already filed) on its Petition for Rule Making (RM-11828), ARRL has stressed that updating HF privileges for the entry-level Technician license “is the sole subject and intent” of the petition. ARRL filed its reply comments on April 29, urging the FCC to disregard comments irrelevant to its petition and maintaining that Technician privileges must be relevant within the context of today’s technological environment.

 

“[T]he increasingly rapid pace of change in communications technologies, coupled with the national need for self-training in science, technology, engineering, and math” necessitate the rule changes requested, ARRL asserted. “ARRL made its request because of the gap between today’s digital technologies and the privileges accorded the current entry-level Technician license.” ARRL characterized its proposal to update the rules as “balanced and modest.”

 

“If adopted, there would be no change to the operating privileges for all licenses classes other than those of the Technician class,” ARRL said. ARRL in 2018 asked the FCC to expand HF privileges for Technician licensees to include limited phone privileges on 75, 40, and 15 meters, plus RTTY and digital mode privileges on 80, 40, and 15 meters. The FCC invited comments on the proposal in April.

 

ARRL pointed out that some comments filed on its petition address subjects related to other open proceedings rather than expanding Technician privileges, citing comments cross-filed in such proceedings as WT Docket 16-239, RM-11708, RM-11759, and RM-11831. “Those filings should be considered in the proceedings that they address, rather than here,” ARRL said.

 

ARRL said some opposition appears based on fears of increased interference potential due to additional digital operation by Technicians. “It is improbable that all, or even a majority, of Technician licensees suddenly would develop a passion for the same digital technology,” ARRL said. “Our hope and expectation is that many will engage with digital modes on the high-frequency spectrum at issue, but it is unrealistic to suggest that every Technician licensee blessed with new privileges would suddenly appear on the same band.”

 

The comments note the development of very efficient digital modes such as FT8, which occupies just 90 Hz of spectrum per signal. “The experience with FT8 clearly demonstrates the attraction of the digital modes and the spectrum efficiencies that can be achieved,” ARRL said. “This is why opening up limited digital opportunities to new radio amateurs so clearly would serve the broad public interest as well as the specific purposes of Amateur Radio in experimentation and innovation, as enumerated in the governing FCC rules.”

 

ARRL further said that comments regarding disagreement on the definition of encryption for masking the content of certain digital transmissions also are “out of place in this proceeding” and “should not delay initiation of a proceeding” proposing to update Technician privileges.

 

“Technology has changed dramatically in the Amateur Radio domain, and the ARRL believes the requested Technician license enhancement would foster the regulatory goals for the Amateur Service and continue to increase amateurs’ historical experimentation and service in a meaningful way,” ARRL concluded.

Intro to amateur radio presentation

 

A Basic ‘What is Amateur radio’ presentation was held at the Gulf Coast Amateur Radio Club’s club house on Sunday. 03-11-2018. A non-ham Florida club “Florida III% Patriots” was in attendance. For the past couple of months I have assisted on helping members get licensed by getting them Tech manuals from A.R.R.L. We now have 3 new hams. Two techs and a General.

PSK Digital Class

PSK Digital Mode Class

When: September 16, 2017 at 1:00 pm (1300 hrs)

Where: GCARC Clubhouse (see About Us)

Instructor: Ralph McCullough WA3YFQ

 

Gulf Coast Amateur Radio Club will be presenting a PSK Digital Mode class at the clubhouse on September 16, 2017 at 1:00 pm. Ralph McCullough WA3YFQ will be the instructor.  IF you’ve been thinking about learning PSK this will be your opportunity.