30A, approx. 5-15V - SMPS
Much less noise that the existing SS-301X.
Be sure to make the modification for 220-240V operation before powering up. The fuse should also be changed to a 4A fuse.
Search found 834 matches
- Mon 18 Jan 18 2021 2:05 pm
- Forum: Radios
- Topic: Daiwa SS-330W SMPS
- Replies: 0
- Views: 22
- Thu 14 Jan 14 2021 11:36 pm
- Forum: General Discussions
- Topic: Making a 1:1 current balun for center-fed dipoles
- Replies: 0
- Views: 24
- Tue 12 Jan 12 2021 7:27 pm
- Forum: Radios
- Topic: Retevis RT-95 VHF/UHF
- Replies: 3
- Views: 1448
Re: Retevis RT-95 VHF/UHF
Attempting to use USB tethering through an Android phone to the rock64 board. The connection needs to be made and then USB tethering can be enabled on the phone. Note that a reset of either the phone or the rock64 board will turn this off and requires manually re-enabling. In order for the usb0 inte...
- Tue 12 Jan 12 2021 12:22 am
- Forum: Radios
- Topic: Retevis RT-95 VHF/UHF
- Replies: 3
- Views: 1448
Re: Retevis RT-95 VHF/UHF
USB sound card used is a Vention VAB-S13&VAB-S17 sound card, based on the HS-100B chip.
This enumerates as plughw:0 in linux.- Tue 12 Jan 12 2021 12:16 am
- Forum: Radios
- Topic: Retevis RT-95 VHF/UHF
- Replies: 3
- Views: 1448
Re: Retevis RT-95 VHF/UHF
Based on what we built, the RT-95 should be set to output audio on the hand mic:-
(1) FUNC -> (16) SPK -> HAND (or M&H)
VOL is 8
SQL is OFF
CDT is OFF
BND is W
On the Rock64, alsamixer has the CAPTURE level set to 76.
(1) FUNC -> (16) SPK -> HAND (or M&H)
VOL is 8
SQL is OFF
CDT is OFF
BND is W
On the Rock64, alsamixer has the CAPTURE level set to 76.
- Mon 11 Jan 11 2021 10:52 am
- Forum: Licensing and Regulations
- Topic: Radio Amateur Examination
- Replies: 1
- Views: 808
Re: Radio Amateur Examination
Additionally - there are a number of useful sources that can help you prepare for the more technical parts of the exam.
https://slideplayer.com/slide/15334207/
https://hamstudy.org/
https://rsgb.org/main/clubs-training/tr ... ock-exams/
https://slideplayer.com/slide/15334207/
https://hamstudy.org/
https://rsgb.org/main/clubs-training/tr ... ock-exams/
- Mon 11 Jan 11 2021 10:49 am
- Forum: Licensing and Regulations
- Topic: Radio Amateur Examination
- Replies: 1
- Views: 808
Radio Amateur Examination
For those wishing to get their amateur radio license in Singapore, you will need to take the Radio Amateur Examination (RAE). There are two classes, Restricted and General. The following are some material that you can use to familiarize yourself with for the tests. https://www.sarts.org.sg/on-line-r...
- Fri 08 Jan 08 2021 11:33 am
- Forum: General Discussions
- Topic: Packet Radio (AX.25)
- Replies: 5
- Views: 1294
Re: Packet Radio (AX.25)
For rock64, you need to either enable AX.25 support in the Linux kernel or compile the modules. These instructions should work:- http://k4gbb.us/docs/raspberry.html For the autogen to work, you also need to install automake and the ncursesw library:- sudo apt install automake libncursesw5-dev AX.25 ...
- Wed 06 Jan 06 2021 10:25 pm
- Forum: General Discussions
- Topic: SARTS Repeaters
- Replies: 6
- Views: 1065
Re: SARTS Repeaters
Measurements of the repeater cavity shows that it is very likely detuned and will require re-tuning of at least one of the receive notches and one of the transmit notches. Of the four, only two are correctly tuned at the moment. S11loss-9V1cavity-6Jan.png VSWR-9V1-6Jan.png The markers are as follows...
- Tue 05 Jan 05 2021 9:27 pm
- Forum: General Discussions
- Topic: Packet Radio (AX.25)
- Replies: 5
- Views: 1294
Re: Packet Radio (AX.25)
In order to get Direwolf working with the rock64 SBC, we will need to figure out the appropriate GPIO pins to use for activating the PTT. The GPIO pin numbers are going to be different from that of the Raspberry Pi. The mapping for the 40-pin header is as follows:- rock64-GPIO-map.jpg More info can ...