Questions tagged [repair]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2
votes
0answers
28 views

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 ...
0
votes
2answers
88 views

Where can I find a service manual for the TECSUN PL-660 to replace the failed circuit board flex cable myself?

Diagnosed three nonfunctional TECSUN PL-660 radios (one from eBay Anon-CO, and two from Amazon) where can I find a service manual to replace the failed circuit board flex cable board assembly part? ...
3
votes
1answer
186 views

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-...
5
votes
2answers
207 views

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. ...
1
vote
1answer
38 views

How to avoid acoustic feedback while fixing radios?

CQ CQ CQ de BH4FHO. I have been fixing some radios recently - buying used radios for cheap, fix them up and modify them to transmit in ham bands. When testing them out, I am using my Baofeng DM-1801 ...
3
votes
1answer
228 views

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: ...
0
votes
2answers
415 views

Yaesu FT-817 Won't transmit Dig, SSB or CW

I have a problem with my Yaesu FT-817 it Won't transmit Dig, SSB or CW, But it does transmit AM, FM and Pkt on all bands. Does anyone know what the problem might be. The Radio receives fine on all ...
4
votes
1answer
180 views

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 ...
1
vote
1answer
150 views

How to identify the mic connection pins in Heathkit SB-102?

One of the things I need to do to put my Heathkit SB-102 into service is connect a microphone. I've got a suitable crystal mic, with four conductors in the cable -- two for the mic element, and two ...
4
votes
3answers
299 views

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 ...
2
votes
1answer
343 views

Presumably working FT-8900R doesn't turn on. What can be a reason?

I bought a pre-owned Yaesu FT-8900R. Sadly turned out that the radio doesn't turn on. When I hold the power button (the right bottom one) the speaker pops briefly but nothing else happening. The ...
3
votes
3answers
903 views

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? ...
5
votes
1answer
893 views

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 ...
0
votes
1answer
508 views

How do I replace the Li-ion battery in a Kenwood TM-741A?

I'm in Dominica working with a donated TM-741A. The internal memory backup battery lasted just long enough for me to learn three things: there's a backup battery; it's dead; there's no manual ...
0
votes
2answers
121 views

Motorola XT180 not charging

Some months back I bought a pair of XT180s and they've worked great. The problem is that it seems one of them was not charging all this time (I was wondering why the charging station only lit the ...
3
votes
3answers
2k views

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 ...
2
votes
1answer
535 views

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 ...
3
votes
3answers
481 views

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. ...
0
votes
1answer
598 views

How to diagnose DRAKE TR7 power problem

My son was recently gifted a vintage DRAKE TR7 ham radio. It's been "in the attic" for 20+ years. When we try to power it up, the (separate) power supply turns on and we have checked with a multi-...
1
vote
2answers
405 views

Intermittent receive on FT-990

My FT-990 often does not receive well after it powers up. i.e. Tuning across various bands, changing from one VFO to the other, few if any signals are heard. Briefly tuning up (CW) with low power ...
0
votes
2answers
699 views

Broken IF Transformer (tiny and 455 KHz)

I broke so called 'IF transformer' on my radio. I was just slightly trying to regulate it to follow an instructions that is found on Wikihow page. My aim was to listen to the conversations of pilots ...
1
vote
1answer
178 views

How to fix stickey VFO knobs on medium to old radios

I have a collection of medium old (in my opinion) radios such as a ts-440, ft-920, ft-840 and on all of them the vfo/tuning knobs are very stiff and "stutter" when turning. These radios have been in ...
1
vote
0answers
50 views

Relay cross reference for 1925-3-2

My amateur radio uses 1925-3-2 relays on the low pass filter board to select bands. This relay is no longer available. Is there an alternative I can use? Or something?
1
vote
1answer
100 views

Is preheating required before replacing an old valve?

I have a Drake transceiver. I want to replace the valves in the final output stage. The valve in question is a 6jb6. I was told by elmers that the valves need to be preheated (cooked) before ...
6
votes
3answers
533 views

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 ...
5
votes
1answer
134 views

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 ...