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Author Topic: Crossband an Alinco DR-635T/E  (Read 3355 times)

Posts: 4

« on: September 12, 2006, 02:52:10 PM »

I have a new Alinco dual band and want to learn to crossband with a HT.  There are no instructions in the manuel, but there is a little piece of paper stuck in the box describing how to supposedly.  It says to set the frequencies you want in the left and right side of the dual band, and then shut down.  Push and hold down the "band" button while pushing the power button. This does show as the instructions say an R (repeater crossband mode) and a * when done on the right side of the radio.

When I try to transmitt on my HT to the alinco on either of the frequencies I either get nothing or it starts flashing the bands back and forth (left frequencies become right, right become left) and the left TX light comes on and it is throwing a carrier.  It flip flops and never stops or puts anything out.  

Can anyone tell me the right way to set it up, and should I transmit from the HT to the freq on the right or the left(main).  


Posts: 19

« Reply #1 on: September 12, 2006, 04:29:45 PM »

You did not mention the frequencies being used.  If the 450 freq is close to 3 times the 2 mtr frequency you will have that kind of problem from 3rd harmonic.

73 Jim

Posts: 380


« Reply #2 on: September 12, 2006, 04:35:25 PM »

You are probably desensing the dual band radio if you are standing so close that you can see the display.  Try separating the radios by a block or two... or at least from a different room.  The other situation could be stray RF getting into things... again separate the radios some.  Is the dual band radio properly hooked up to a dual band antenna (or separated out to two antennas).  If that fails to fix things check back in, and we can explore other avenues.
Good Luck

Posts: 9930

« Reply #3 on: September 12, 2006, 05:43:56 PM »

Just for arguments sake I have several rigs that will cross band repeat and have yet found a decent excuse to use it.. But I may some day..Smiley

Posts: 26

« Reply #4 on: September 16, 2006, 12:18:58 AM »


Unfortunately, it is almost impossible to operate crossband repeat legally.  The ARRL's has an article called 'How are you controlling your repeater' that discusses this.  It is available on the web as a PDF.

From the ARRL's web site it appears to only be available to members.

I did find a copy here:

So, if you can find a way to make it legal:

For the purpose of this discussion, let's say that we have two frequency configurations.  One we will call A and the other we will call B.  A is the .70m frequency that your HT will be accessing / listening to.  B is the configuration for the 2m frequency you actually want to access (ex: your favorite repeater).
(You definitely cannot legally control using a 2m frequency and access a .70m frequency)

Set up config A on a .70m frequency suitable for remote control.  Be careful in choosing this frequency.  You don't want to interfere with other repeaters / stations.  You also probably want to set up the 635 to use the tone squelch on this configuration.  Then configure your HT to transmit the configured tone.  This will in most cases prevent you from crossband repeating a stray signal that just happens to appear on that frequency.  You would probably want to set this configuration to low power (5 watts).  Why blast a high power signal on this frequency?  You will most likely be fairly close to your crossband repeater.

Press the band button so you can set up configuration B.  Set up config B for the 2m frequency you wish to gain access to via crossband repeat.  So, if you are hitting a repeater have the offset and any tone settings set correctly for the repeater.  You should set the power on this configuration to the minimum required to reach your target.

Initially it does not matter whether you start with config A (the frequency your HT will be accessing/listening to) on the left or right side of the display in the 635.

Enable cross band repeat (turn off the radio, hold down the band button, turn on the radio).  

Basically, the radio now listens on both frequencies.  Whenever squelch is broken on either configuration it is listening on, it retransmits the signal on the other configuration.  And yes the configurations do swap between the right and left side of the display such that one side always holds the configuration that is transmitting.

You cannot transmit from your control frequency until the carrier drops from the repeater (or other station on .70m).  So you are at the mercy of others.  If the carrier never drops, you won't be able to transmit.

Turning off crossband repeat is the same as turning it on.  Turn the radio off.  Hold the band button.  Turn the radio on.

You will probably find it impossible to operate crossband repeat legally.  It really is a shame.  The 635 really does crossband repeat well.

I hope this helps,



Posts: 4

« Reply #5 on: September 29, 2006, 12:19:53 PM »

Thanks for the reply, I felt really stupid when I discovered that one side of the transmitter has to be on a the 440 band and I had both on the 2meter band.  I guess that is how newbies learn though, and I got a lot of replies that helped me understand possbile future issues.  

Thanks for the help.
Richard Kenley

Posts: 13

« Reply #6 on: October 23, 2012, 10:01:55 PM »

There is absolutely nothing illegal about crossband operation if both the xmit and receive frequency are within the ham bands. I xmit TO the Alinco on UHF simplex (CTCSS and CRCSS)and out of the Alinco to connect to a repeater input, which works very well for being away from a vehicle for public service work.
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