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What type and size Torx bit to remove a Baofeng mic and speaker cover plate?

What type of driver or Torx wrench do I need to remove the 5 Torx-type button-head screws (marked with red dots) in this photo? I need to remove it in order to slightly enlarge the hole over the ...
Mike Waters's user avatar
  • 8,081
2 votes
1 answer
60 views

Use of Yaesu FT-7800R External Speaker Jack Loss of Audio

I plugged an external speaker into our Yaesu FT-7800R EXT SP jack. As a result, I've lost audio, both when the speaker is plugged in and not plugged in. A ham told me that the FT-7800R has a known ...
octopusgrabbus's user avatar
3 votes
2 answers
469 views

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 ...
uhoh's user avatar
  • 543
-1 votes
1 answer
269 views

Jennings variable vacuum capacitor

I have a Jennings CVDD 500 vacuum capacitor which is not working. Think it's a mechanical problem because I have another one and it works. The symptom is that it is always electrically shorted.
HB9FIH's user avatar
  • 47
1 vote
2 answers
176 views

How should coax be physically wired to a "stud" mag mount?

I picked up a variety of antennas at a swap meet a while back, and am having trouble characterizing an unlabelled HF (or low VHF?) vertical element that screws into a stud in a magmount I also brought ...
natevw - AF7TB's user avatar
2 votes
1 answer
337 views

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. ...
Ben Madison KO4UXC's user avatar
2 votes
0 answers
173 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 ...
Alex Turner's user avatar
0 votes
3 answers
936 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? ...
JWC1976's user avatar
3 votes
1 answer
449 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-...
essential555's user avatar
6 votes
2 answers
2k 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. ...
user avatar
1 vote
1 answer
41 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 ...
Maxthon Chan's user avatar
4 votes
1 answer
1k 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: ...
Paul's user avatar
  • 1,455
0 votes
2 answers
1k 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 ...
sam kid's user avatar
4 votes
1 answer
282 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 ...
Andrew's user avatar
  • 3,723
1 vote
1 answer
412 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 ...
Zeiss Ikon's user avatar
  • 4,147
5 votes
3 answers
537 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 ...
Zeiss Ikon's user avatar
  • 4,147
2 votes
1 answer
847 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 ...
Aleksander Alekseev - R2AUK's user avatar
3 votes
3 answers
2k 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? ...
scook's user avatar
  • 31
5 votes
1 answer
2k 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 ...
user3486184's user avatar
  • 1,957
0 votes
1 answer
927 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 ...
Brian K1LI's user avatar
  • 7,878
0 votes
2 answers
257 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 ...
Aida Paul's user avatar
  • 101
3 votes
5 answers
4k 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 ...
Geo...'s user avatar
  • 151
2 votes
1 answer
841 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 ...
Mike Waters's user avatar
  • 8,081
3 votes
3 answers
1k 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. ...
Luca's user avatar
  • 329
0 votes
1 answer
866 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-...
David Cheslow's user avatar
1 vote
2 answers
569 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 ...
user9052's user avatar
0 votes
2 answers
960 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 ...
Karel Capek's user avatar
1 vote
1 answer
318 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 ...
Arthur's user avatar
  • 339
1 vote
0 answers
58 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?
Dave nf4r's user avatar
1 vote
1 answer
121 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 ...
user avatar
8 votes
3 answers
794 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 ...
W5VO's user avatar
  • 1,921
5 votes
1 answer
166 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 ...
Adam Davis's user avatar
  • 12.2k