Wednesday, 29 March 2017

SSB Ham Radio Satellites a beginners guide

Check the satellite status first

To check the status / mode of a satellite, please use this link
Some satellites switch between data and transponder (repeater) modes.
This will save disappointment when all you hear is data, when you wanted a qso, or vice versa.

Note these SSB satellites DO NOT use CTCSS tones

You can download a chirp file here

In the charts below you will notice that transmit (UP) is always lower side band (LSB)
So it makes sense that Receive (DOWN) is always upper side band (USB)

It is highly recommended, if not required when operating SSB satellites to use 2 radios so you can hear your downlink, and not tread on anyone's toes or cause interference. It will also greatly help find your in and out frequencies.So please be considerate, operate well, listen lot's.

If you do not have 2 radios for full duplex operation, it is possible to work satellites using semi-duplex. However this is reserved for expeditions, or rare occasions where 2 radios is just not practical. Its frowned upon in the satellite community and causes issues.

These issues as you will hear frequently on the FM satellites include the operator calling CQ repeatedly and not able to hear the reply or calling out over the top of someone as there were not aware they were there. Just like on a normal repeater these habits are bad practice and cause frustration to others users, imagine missing that rare square or locator due to someone shouting cq over the top of you and just as the satellite pass finishes.

DON'T call CQ, listen and respond, if no one is around call sign sat (call /sat...)
a general qso is hello call, this is call your signal report 5/9 my locator IO67AS.
Short and simple, should be able to get a few in one pass, but if you have to ask the operator to repeat this takes up valuable time.

If you really have the need to work semi-duplex (Please don't)

How do I set the radio up to do split frequency / mode?

We only have access to a Yeasu 817 and 859, so We will include the instructions below, happy to add more makes and models as needed if it helps.

Yeasu 857D and Yaesu 817
Press the [FUNC] key momentarily, then rotate the SELECT knob, as needed, until Multi Function Row “a” [A/B, A=B, SPL] appears on the display.

Now press the [A](A/B) key to toggle between the “A” and “B” VFOs.

As an example for FO-29 set VFO "A" as 435.850 LSB Down / receive
Press [A](A/B) will move you to VFO B and set the frequency to 145.950 USB
Press [A](A/B) again to return to the VFO A
Press [C](Split) do a test TX and check that you RX on 435 and TX on 145
You are now ready to try Sats, change the up / down frequency for each Sat

Listen several times before you attempt to transmit

As with all good radio practice, get used to the new mode and operating style before attempting a CQ call or QSO. SSB satellites are a little bit tricky to receive initially, especially if you are going to tune manually (which we are). Using your favorite satellite tracking software work out where about the pass is, and point the antenna in that general direction. Using our example of FO-29, start at 435.850 and tune *slowly* either side of that until you hear a qso, this may be Morse or Voice. See how the signal drifts up or down the band, tune to adjust for this (Doppler effect). Get used to this slow tuning technique, it will be needed in the next stage when you are ready to transmit.
Peter 2e0sql on FO-29 its not easy initially tuning !

Morse code heard on FO-29

Attempting your first SSB QSO on Satellite

Once you have a good grasp of listening and tuning to follow a conversation, its time to try and call CQ. The charts below give you a rough idea of where you transmit and where you should be heard.
On FO-29, you transmit on 145.950 and should be heard around 435.850 +/-
Arranging a schedule with a more experienced sat operator, will be good idea on your initial go, they will be able to find you and respond (thanks Peter 2E0SQL).
So once the satellite is overhead, start calling CQ on the center frequency 145.950, give about 15-20 seconds, this allow the receiver to find and tune in to you. When you stop transmitting listen for a response, tune a small amount either side and see if you can find someone calling back to you.

Following what is referred to as, click the link for an in depth discussion,  the one true rule
The best approach is to tune on the higher frequency band (UHF / 70cm / 435.x)

For FO-29 and AO-7 (Mode A),You will adjust RX frequency, as this is the higher frequency used.
If you get a response, put into practice what you learnt above and tune slowly to get the best reception.

However, on the other satellites where the Frequencies are reversed we need to tune the TX frequency as this is on the higher frequency

Using the charts below, they help give you a rough idea of where you TX and where you should be heard.

Bob M6FLT and Ian 2E0IPP at Windsor Castle having just worked FO-29, 5 watts Yeasu 817 and arrow antenna.

We want to hear how you get on

We are keen to hear how you get on tracking and working satellites and would be happy to share pictures, sound recordings and videos. We are on Twitter @chertseyrc and via e-mail

Here are several charts to help you with the SSB satellites kindly provided by Paul K5PAV‏ 

Thursday, 23 March 2017

SO-50 and Fo-29 Satellite passes at Windsor castle

Shot of Windsor Castle our /p for the night

Bob M6FLT trying sats.
Iam 2E0IPP working sats.
Ian and Bob working Peter on FO-29
Ian and Bob after the FO-29 pass

Have a listen to the recording here:

Trilogy / kydera cdm-550h 40 Watts UHF Mobile DMR

So the 550 arrived and this is a quick demonstration of what in the box and how to set it up.

Please throw away the CD, its not needed and is probably not a good idea to place on your PC, please download software from web site.
Box contains the usb / programming cable, power cable, mounting bracket, mic bracket, microphone and of course the radio!

Here is the radio fresh out of the box, The radio is 140X175X46MM average size for a mobile.
The radio has a large display and several easy access buttons. Top Left selects the Talk group, Right top is digital volume, bottom is analogue volume control.

As you can see, when powered up, using a PSU or 12V battery, the screen is large and bright, easy to ready with large clear text. The surrounding buttons are also illuminated which will help when used in the car at night. From the display you can see Digital is selected (black arrow pointing at digital), pressing and holding the right bottom button will select Analogue mode. The last line shows the Repeater you are on, and the second line shows the talk group. The very top line shows the signal, power level, time and current voltage.

When you press the bottom left button, you access the menu, using the top left tuning knob, you can move up and down the menu, pressing the bottom left button to select the sub menu's.
From the menu you can adjust the power, change the repeater, set up the GPS, set time and date and send / receive text messages.

Quick video above showing menu being accessed.

Video above working into my local repeater GB7HR and a short conversation.
You can hear the quality of the incoming call is crystal clear and no issues at all.
The DMR ID is displayed, and in the contacts setting you could add the ID / name and the name would be displayed.

All the usual DMR features work on this mobile radio, Text messages, stun, kill, emergency alarm.
This model also has GPS, a GPS antenna is connected at the rear of the unit using a SMA connector.

The main aerial connector is a standard SO239.

I'll add more pictures and video wit the advanced features as time permits.

So you have a quite powerful fully featured DMR mobile, how much is this going to cost you?
Programmed and delivered £295. This includes the import duty and currency exchange fee's.

Remember Trilogy was created from Chertsey radio club and its principles are to supply cost effective DMR equipment, programmed and ready to use out of the box. We do not charge VAT, we do not make profit.

Please contact for more information


james / M0JFP / WO2I

Monday, 20 March 2017

GB4LNX Lynx helicopter special event station

BBC New articles:

The fly over as seen from Chertsey:

Our radio station:

Received QSL cards for our special event station:

Thursday, 16 March 2017

New release of DV4 mini software and firmware but older dv4 ownersbeware!!


The headphone / PC ONLY works if you have the new dv-mini with the built in AMBE chip.
If you have the older version then sorry its not going to work for you!

We are asking if an upgrade will be available and will keep you all posted.
Wireless holdings offered trade in for $99

The firmware and software upgrade for standard dv4-mini is to improve the DMR QRG correction, this is now automatic.

For the AMBE folks you now get PC access to C4FM

Version of 6.3.2017  of the dv4-mii software comes with an additional feature which we had not seen before.

Like the original blue Dstar dongle, the DV4-mini can now allow you to use the PC headset (speakers and microphone) This means you no longer have to have 3 different radio's to use the 3 different modes, dstar, dmr, c4fm / fusion) 

Once you have downloaded the software and installed it, to set up the headphones you have to run a program separately, in C:\Program Files (x86)\DV4mini you will find a program called PCMtrx, double click on this to bring up the audio controller and set to your pc speaker and microphone (or headset)

Downlaod software and the latest firmware here.

Also noting that by connecting your psk data dongle you could with some hacking create an EchoLink type node!
More on this later (c)CRC imagination