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LCARA HAM Radio: Troubleshooting the Repeater / Bad Duplexers!?!? - Part 3

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Welcome to the Lake Cumberland Amateur Radio Association Club's RU-vid Channel.
Could the duplexers be at fault with our repeater? Let's find out!
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To join Lake Cumberland Amateur Radio Association you can email dmunsey@windstream.net. You do not have to be local to our area and with Echolink, you can join in the fun on the Nets!
President - Don Munsey, AC4DM
2M Nets:
Sunday @8:30pm Eastern in the USA
Tuesday @8:30pm Eastern in the USA
10M Net:
Thurdday@8:30pm Eastern in the USA
Echolink - AC4DM-R
Kentucky DStar Net:
Thursday @5:00pm Eastern in the USA
Reflector 056B
Repeaters:
2M - 146.880 PL Tone 77Hz
70CM - 443.600 PL Tone 100Hz
DStar - 444.8375 Digital Voice (DV)
GMRS - 462.700 PL 118.8 (Please ask for permission to use when you are in the Lake Cumberland area)
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Опубликовано:

24 авг 2024

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Комментарии : 14

@sleeve8651 9 месяцев назад

When he said, " Dummy Load ", which guy was he talking about ? Seems theres always one, sometimes more ! 😂🤣😂

@BurtonChristmasLites Год назад

Make sure you are using RG-214, NOT RG-213 in the cabinet. Double shielded cables. Robert KD4YDC

@rballad142 7 месяцев назад

I’ve tuned duplexers including that Wacom you attempted to tune, using a MFJ259, a handy, a dummy load and a homemade RF probe. Was amazed how close you can get, particularly if you know what you are doing. A spectrum analyser helps being precise and setting insertion loss to levels at which the Q remains decent. I love my Rigol DSA815TG.

@Richard_OKeeffe Год назад

First raule of fault finding .............. it's usually always the last thing you check that is the problem 🤣

@Hero1395 Год назад

I used to tune duplexes in a similar way until I bought a Rigol DSA815-TG and return loss bridge. Best money I ever spent for repeater maintenance.

@rballad142 7 месяцев назад

The band reject is way more important than the bandpass over which you spent most of your time. That crude method you used may not always work for band reject without causing desense of the RX. particularly when. running an amplifier. If you don’t have a spectrum analyser. a better way to optimise bandreject is to use a Rf probe and a dummy load to tune the reject for minimum voltage across the dummy on the reject frequency. Even a nanovna should give decent results although it lacks the dynamic range.

@rickhole Год назад

Could you have depowered the repeater and coupled the feedline to a portable receiver on the input frequency, at the antenna connection to the duplexor, then at the output of the amplifier, then at the receiver input to determine quickly where the signal was lost? That could have eliminated the new antenna install , new feedline, a tower climb, tuning the backup duplexor. Maybe I am missing something. I last tuned a duplexor 20 years ago. A great episode!!! 73 de N8RL

@jbx907 10 месяцев назад

Nano vna is not going to cut it😂😂😂

@sleeve8651 9 месяцев назад

Doesn't the FCC say use only the amount of power necessary to establish the contact ? If you're not using an amplifier now, and can work the repeater from Fifty miles, why do you need an amplifier ? 🤔.....?

@bigchew3149 Год назад

i have ben into radios for 35 years & i have had several pull my hair out events over the years & 90% of the time its something simple..Like a bad jumper..i fought one for a 3-4 weeks just to figure out it was a bad jumper..I then bought all new Teflon pl259's & so239 Connectors & that was that ! But i may have ben running a little Heat to but i will never tell..lol.

@jbx907 10 месяцев назад

Not tousandth, it micro or millionth of a volt