Kydera Dr-880
Martta
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I just picked up an old Kenwood TH-79A really cheap at a local swap the other weekend. After getting the documentation in pdf format off the Internet I saw it has a cross band repeater function built in. This is NOT the same as cross band operation, but a true repeater operating V/U or U/V.
Not many handhelds that I know of with crossband repeat. Almost all the ones that I know of are higher end mobile units not ht.
Most of the hams I know will only use it when walking from their truck/car to get some extra range. Say walking down the hill but trying to hit the repeater on the otherside.
Personally, I found it tiresome throwing out the call sign with the mention I am cross band repeating and what frequencies. But eh I am lazy.
Really only i know of capable is the Yaesu Ft51r. Not sure if even hts with true duplex are capable nowadays.
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That's the other issue with cross band repeat operation, the ID problem. I don't know of any radios that have the ability to TX the call sign as required when TX'ing from the repeater to the user's radio. The repeater's TX has to self ID on the Ham bands.
So does the Kydera dr-880 uv. 5 watts probably not as effective for crossband repeat but notice the current options are basically Chinese.
Any reason an ht and not a mobile unit. Just curious as to the use case.
I do have a friend that his house acts like a Faraday cage. So he bought a kenwood 71a to cross band to hit repeaters with his handheld in the house (when cooking during nets). He choose that one because of the autoid function on crossband repeat.
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I still have some setup to do with mine, but I'm working out something similar with my icom base. I can get good signal from the repeaters with the ht, but not get out strong enough to open them consistently
Planning to set the codes on the base so I transmit ht to base and it retransmits crossband, (since both I generally use have vhf and uhf linked). However, through codes and/or squelch, I'll set it so the base isn't transmitting back to the ht, so I think I'm okay without autoid as the only transmits will be carrying mine going out carrying my call
That's what I tried with my FT847. I used it in the satellite mode half duplex. The HT would TX to the base radio which x-banded to the local repeater. The HT would then RX the repeater's output directly. No issue with worrying about the ID requirement since I always went from the HT to the base so when I ID'd the base would of course be ID'd as well.
The part with the HT which has to operate split band, TX on one band then RX on the other. My big disappointment was the Kenwood TH-D74A. You can't program any of the memory channels that way. The TX and RX frequencies have to be on the same band. Since it does have two VFOs, RX sections, it can still be setup to sort of work that way but it's a lot more of a hassle. It's one of the reasons I still keep my ancient TH-G71A around and several CCR's. That radio is very easy to program for split band operation.
Yeah, I think my use case makes it easier being linked repeaters...all my HTs are UHF only except the baofengs, so I listen and transmit to the base on the UHF side, and the base transmits out on vhf. Been testing with a baofeng, but once I have it all set, I'll program the channels into the one of better radios.
I picked up one of those simple full duplex repeater controllers where you plug in two HT's with the antenna ports cabled into a dual band diplexer. The controller has a built in battery but no ID function.
I got a diplexer from MFJ that claims 60db of isolation between the VHF/UHF ports. Most do no more to 40 to 50 db. You really need to read the spec's on these things before spending your money on one. The cheap Chinese cavity notchplexers only claim 70+ db isolation between the TX and RX ports as it is for an in-band repeater.
The less isolation you have the lower the TX power allowed to reduce desense. Some cases I've read where there was desense the TX power was reduced, not an intuitive thing to do without understanding how the system works.
I only got one with a speaker microphone, battery pack (the lower power 6VDC one), case for expendable batteries, antennas and charger. All for $15 with original documentation and box. The radio looked like it was treated well, minimal scuffs and scratches and seemed to work when he showed it to me.
I see an extra telescoping antenna, but not sure if it is dual-band. I always loved my telescoping 5/8 wave for 2 meters (1/4 wave when not telescoped) but it was a long doozy! Would really increase the range.
These radios could "clone" each other over the air, so that all channels would be duplicated. I believe RT sells software for this model, but I never purchased it; just inputted everything by hand then cloned my other TH-22a from the other one.
The battery packs were originally Nickel Cadmium, but I had mine rebuilt into Nickel Metal Hydride. Then a Lithium-Ion pack became available so I purchased one of these (with its own charger wort), too.
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