Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [repair]

30 questions
8
votes
3 answers

Morse Code Key Grease

I just got an old brass key at a hamfest, and it appears to be in pretty good mechanical condition, aside from some dirt and dust. Taking it apart, the key (apologies for not knowing the exact terminology) is held in place by two cups with four ball…
W5VO
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6
votes
2 answers

Can an oscilloscope be used as an RF voltmeter?

I just recently acquired a slightly functional Icom IC-735 HF radio, and am trying to resurrect it. The service manual outlines procedures that specify the use of an RF Voltmeter, which I do not own. I do have a Tektronix 2236 dual channel 100MHz…
user14945
5
votes
3 answers

Heathkit SB-102 Plate Current out of control

I bought a "technician special" Heathkit SB-102 transceiver. Everything seems to work well until I attach a dummy load and try to go through the "initial tune up" procedure in the manual. At the point where I switch the "Mode" to "Tune", instead of…
Zeiss Ikon
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5
votes
1 answer

Is a gradual power-up recommended for non tube based radios?

It used to be that if you wanted to power up an old tube radio, you'd use a variac and gradually bring up the line voltage to avoid damage to the radio. Is this needed or suggested for transformer powered semiconductor radios that have been sitting…
Adam Davis
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5
votes
1 answer

How do I put an RJ-45 connector on to repair a Kenwood MC-59 microphone cable?

I've got a Kenwood MC-59 microphone, which started fraying around the place where the mic cable goes into the body. I thought I'd cut it off and put a new RJ-45 jack on it. After cutting the cable, I discovered something completely unexpected.…
user3486184
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4
votes
1 answer

How can I replace the NiMH battery in an old RigExpert AA230 Antenna Analyzer?

I have an AA-230 Pro Antenna Analyzer. Its similar about 5-10 years old with a failing battery. The battery will only hold a charge for a day or so, and only for minutes while in use. I tried: looking for a manufacturer's replacement, but it's a…
Paul
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4
votes
1 answer

Identification of valve

My favorite receiver used for 40 m AM broadcasts has a cracked valve, but the valve type normally printed on the glass has rubbed away. Can anyone tell me what the numbers for this valve are ? The radio is mid - late 40's, made in Australia and has…
Andrew
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3
votes
4 answers

Repairing a Tecsun PL-660

Two years ago, my father and I both received a Tecsun PL-660 radio as a Christmas gift. We both have had good experiences with our radios and generally enjoyed them until they recently both stopped working. I should mention my radio has been at my…
Geo...
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3
votes
3 answers

Iskra sst 2030 radio speaker plug

I was asked by a friend to take a look at an old 70-80s Iskra sst 2030 (ex Jugoslavian-slovenian company) radio. The radio seems to work fine but I can't understand which plug it uses for speakers. Any ideas? Levi is left in slovenian. The rest, no…
Luca
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3
votes
2 answers

Does the Yaesu FT-897D have a BIOS/firmware in FLASH memory that could get corrupted 15 years in storage? Is there a re-install procedure?

I'm helping my non-ham sister disposition my old Yaesu FT-897D rig that's been in storage for 15 years (couldn't take it with me to Taiwan). Other hams are looking at it now. While it worked when I left, after all these years now it wouldn't…
uhoh
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3
votes
1 answer

Globar resistor repair or alternative(s)?

I am restoring a Hallicrafters S-120 receiver and when trying to unsolder the wires, from the electrolytic capacitor, I noticed that one of the terminals of the Globar resistor (880-100 Ohm / 023-00327) was loose. Common soldering practices to…
essential555
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3
votes
3 answers

How to splice RG-174 coax?

I'm pretty good at repairing broken regular coax, but I recently had an RG-174 cut and it's too small for me to solder the center wire and keep the braid away from it. What's a good way to do this? Edits for clarity: this is for a feedline to an…
scook
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2
votes
1 answer

Does anyone repair Flex radios other than Flex Radio?

A local ham that I have an evening sked with on 75m (Paul, W0EBV) sent his Flex 5000 SDR transceiver to Flex Radio Systems to get it repaired a few months ago. However, it seems that Flex is either unable or disinclined to repair it. Paul keeps…
Mike Waters
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2
votes
1 answer

How to handle old stuck tuning slugs?

My Swan 350 radio has tuning slugs in the VFO to handle different bands. The 10-meter band has a slug that wont come out, I may need to use a longer wrench but these old slugs break apart and crumble. What can I do about the slugs and where can I…
Ben Madison KO4UXC
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2
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0 answers

Diagnosing IC-7100 Drive Amp Bias | PA Won't TX

A faulty in vehicle DCDC charger has fed 16V or so into my brand new IC7100, killing the main board and preventing it from transmitting. I've replaced the mainboard with a brand new one however I'm stuck with an non-transmitting PA board. I've…
Alex Turner
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