This is a good article that describes the use of the SA612 / NE602 mixer
PDF here -> UsingTheNe602
No comments
Category: Amateur radio
An optical analog audio compressor
Basic RF matching circuits
How to adjust your parabolic antenna for QO-100 / Es’Hail amateur radio geostationary satellite
VIDEO. How to adjust your dish for QO-100 geostationary satellite:
- Find Astra 28,2 degrees (strong signals in Northern Europe and Central Europe) with a low cost satfinder with sound / analog meter
- This is one of the most eastern TV satellites that are very strong, so you can start east and move towards south until you find the first strong satellite on your satfinder (you should find Astra 28,2)
- Now move a slight bit more to the south until you are out of the strong Ku band lobe of the Astra 28,2
- You should point in the correct direction (elevation is the same in practice)
- If you have a generic LNB the IF should be on 739,7 MHz. Your SDR should be able to tune to that QRG
Join our FB group (exclusively for licenced radio amateurs by the respective government administrations) https://www.facebook.com/groups/252645695661305/members/
Quatar Oscar 100 Geostationary Satellite / QO-100, Es’Hailsat, new Facebook Group for licensed radio amateurs
There is a new Facebook group for Quatar Oscar 100 Geostationary Satellite. (QO-100, Es’Hailsat). Licensed radio amateurs are welcome to join via the link below! (Exclusively for licenced radio amateurs by the respective government administrations).
Members typically discuss equipment, design of equipment, antenna designs, post QSO videos and sound recordings etc. https://www.facebook.com/groups/252645695661305/
ZUMspot + Pi-Star setup guide
If you are looking for a Zumstar + PiSpot setup guide for DMR, then KC6N has made a great tutorial that is available here as a .PDF: https://www.hamdigitaal.nl/download/algemene-informatie/ZumSpot_Pistar_KC6N_20180605.pdf Full credit goes to KC6N, I have taken the liberty to link to the site where this document is available to help other amateur radio ops get on the air with their hotspot setup.
LDG AT-100PROII max C / max L
LDG does not specify either max C or max L of their antenna tuners in the “pro” series. They specify a vague “it can tune 1000 ohms”. This basically means nothing as no frequency is given and it is not given if they mean R or X or Z by “1000 ohms”. There is also no service manual or schematic available. Very disappointing from a serious (?) supplier.
Well, since LDG doent specify anything, I have measured it.
The LDG AT-100PROII is a series L, shunt C configuration.
Min L is 3uH, max L is 11,8uH
Min C is 85pF, max C is 250 pF
This is measured at 2MHz.
This shows that the capability of tuning an 2x20m doublet via “10-12m” of 590 ohm ladder line on 80m seems to be limited, and that tuning on 160m is very difficult.This is mainly due to limited Lmax. Also the limited Lmax gives limitations on other bands as well. Having the proper length of transmission line is important to overcome this limitations. You MAY also use a 4:1 or 9:1 balun. However it is important that the balun does have a very low loss. (Otherwise you you end up with a good SWR but poor efficiency).
Telenor 4G modem, IP camera, remote radio, remote SDR setup (Norwegian language)
Hvis du vil sette opp et 4G IP kamera, en 4G alarm, eller kjøre amatørradio via 4G remote så må du sette opp 4G ruteren din slik at datatrafikk UTENFRA kan komme inn igjennom 4G ruteren. For å kunne få dette til å virke må du kjenne IP adressen til 4G ruteren din. Ringer du Telenor support får du som regel et “god dag mann økseskaft svar”. Ringer du “telenor eksperten”, så får du ofte et nytt “goddag mann økseskaft svar”, men denne gangen må du betale for det! Denne quick guiden omhandler Telenor D-link DWR-961 ruter.
Utfordring 1: Telenor har satt opp sine 4G rutere per default slik at du ikke har en egen IP adresse som er synlig på internett. Datatraffikk utenfra blir også stoppet (av sikkerhetsgrunner – som regel har ikke vanlige brukere behov for at traffikk utenfra skal kunne komme igjennom om den ikke er initiert innenfra først).
Løsning:
- Logg inn på ruteren via kabel i LAN1, LAN2, LAN3 eller LAN4 porten (ikke WAN porten). Du har innloggingsdetaljene fra Telenor (ikke sant?)
- Gå til “internett fanen”
- Endre APN(Access Point Name) til internet.public (med små bokstaver)
- Restart ruteren
- Nå har du en IP adresse som både er synlig utenfra og traffikk kan nå inn til ruteren din
Utfordring 2: IP adressen er ikke fast så den endrer seg hele tiden. Du aner ikke hvilken ip adresse 4G modemet ditt og det utstyret som står tilkoplet på innsiden har…. hvordan skal du da kunne aksessere dette?
Løsning:
- Sett opp en dynamisk DNS
- Viktig: Kun Dyndns (heter nå dyn.com) fungerer. Ingen av de andre dynamisk DNS tilbyderne fungerer.
- Viktig: du må nå betale for dyndns servicen fra dyn.com (ca 500 kr per år). Dette er det ingen vei utenom (som jeg har funnet i alle fall). Dyndns free service er discontinued så nå må du betale for tjenesten.
- Gå hit https://dyn.com/dns/dyndns-pro-free-trial/ og registrer en gratis konto
- Velg et passende sub-domenenavn som f.eks pettersipkamera1.dyndns.org (fyll inn ditt valgte navn). Sub domenet er det som stør før første prikk, selv om det virker litt lite intuitivt at det står før prikken og ikke etter. Domenet er det som står etter prikken, men dette er jo forhåndsbestemt til å være dyndns.org
- Gå til Advanced og DynDNS i oppsettsmenyene i Telenor 4G ruteren din (via web browser)
- Fyll inn brukernavn, passord og hostname. Hostname er det du satt opp over når du registrerte kontoen hos dyn.com. For eksempel pettersipkamera1.dyndns.org
(selv om dyndns nå heter dyn.com så er dyndns.org fortsatt live and kicking)
- Husk å klikke på DDNS så dynamisk DNS er skrudd på i ruterens meny
- Nå vil pettersipkamera1.dyndns.org peke til IP adressen til ruteren din (SELV OM TELENOR SINE SYSTEMER ENDRER IP ADRESSE på 4G RUTERE INNIMELLOM!)
- Så må du sette opp port forwarding, om du bruker egne porter. Dette gjøres i fanen Advanced / Port Forwarding. Du må vite den interne adressen til IP kameraet ditt. F.eks 192.168.0.123
- Du må vite hvilken port IP kameraet ditt bruker
- Så setter du opp hvilken port INN til 4G ruteren som skal forwardes til hvilken IP adresse (f.eks 192.168.0.123) og port inne på det lokale nettverket ditt
- Lagre og gjør en reboot / omstart av ruteren
- Og VIPPS, du ser og kan overvåke din eiendom / hytte / whatever på IP kameraet og er i høyeste beredskap til en hver tid! Alarmsystemer, sensorer, styringer osv kan koples til på denne måten.
- (Om du er radioamatør, så ser du radiosystemet ditt og er klar til å kjøre remote radio).
Håper dette var til hjelp. Ønsker du hjelp til en kommersiell installasjon, IoT eller liknende så kjenner jeg firmaer som kan hjelpe med dette. I så fall ta kontakt så kan jeg formidle info.
FT-891 and TRX-manager CAT control software
I have successfully got FT891 running under TRX-manager: http://www.trx-manager.com/index.html
1) Install the dual serial port driver from Yaesu website.
See manual here: http://www.yaesu.com/airband/downloadFile.cfm?FileID=9515&FileCatID=42&FileName=USB%5FDriver%5FInstallation%5FManual%5FENG%5F1610%2DB0.pdf&FileContentType=application%2Fpdf
(Note: the 891 has dual serial ports, it does not have an USB soundcard).
2) Reboot the PC and check that you see two serial devices in your Device manager (type device manager when clicking the start button)
3) Hold F on the FT-891 in a couple of seconds (long click)
4) Goto menu 05-06
Set CAT RATE to 38400
6) Goto menu 05-08.
Set CAT RTS to DISABLE (unless you do that you may have a problem getting data thru)
7) Set the rate to 38400 in TRX-manager (setup menu) and select FT-891. Also select correct COM port (on my PC it was COM5. It may be different on yours).
Remember: unless you set CAT RTS to DISABLE (see above) you will not get data thru and you will mess around in the TRX-manager menus while the problem was a setting in the FT-891 menu.
8) Stop and restart TRX-manager
9) You may hear a clicking sound for every CAT transmission in your FT-891 loudspeaker (A bit annoying… I have to admit that even if I like Yaesu radios)
10) Click F on the FT-891 (short click)
11) Goto MON on the FT-891 menu
12) Click on MON
13) Turn down the MON level to 0
Note: This applies regardless if you have MON ON or MON OFF (this is a bug in Yaesu’s firmware. Rare. LOL)
14) Now you have CAT control without any clicking sounds on your FT-891
15) Enjoy your Yaesu FT-891
Comments about the FT-891:
Plusses: the FT-891 has in my view a better and more modern RX than the ageing FT-857, even better than IC7300 (some ppl. claim) http://www.eham.net/reviews/detail/13042?page=2 , it is a low cost modern mobile 100W HF rig with a small detachable front, it has DSP RX, a nice variable RX filter, works well down to low voltages even if someone claims it doesn’t, has a much better menu system and a better VFO, it has a reasonable current draw on RX (even if the datasheet overstates this a bit it is below 1A on my rig).
Minuses: No VHF or UHF ( however that may be a benefit. Not the compromises that probably are in the 857 rf chain). No USB soundcard (do you really need that in a mobile station?), 60M USB has to be programmed in a memory and you go memory tune from there and it will keep USB even if you are below 10 MHZ.
How to find all Brandmeister DMR repeaters in your country
Sometimes it is good to know what DMR repeaters are available in a certain country. The Brandmeister repeater listing at https://brandmeister.network/?page=repeaters doesn’t seem to have this per country overview easily available (disclaimer -> I may be wrong 🙂 ).
I have found that by knowing your country master code you can search for that in the repeater page of Brandmeister and all repeaters registered in your country will be shown. For example the country code for norway is 241 and the master code is 2421 so if I enter 2421 I will get all the repeaters in Norway.
Show repeaters in your county