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Questions tagged [connectors]

Questions about RF connectors, including the properties of specific types and how to use them.

4
votes
2answers
81 views

What is inside a 50 ohm termination?

I see RF applications requiring 50 ohm termination to avoid any open port reflections. Curious what is actually inside a 50 ohm termination connector. Is it simply a 50 ohm resistor? But then it is ...
2
votes
0answers
30 views

Using an OPC-478 programming cable for CI-V

I have an [clone of] an Icom OPC-478 programming cable for my IC-208H. I thought I read that I can use that same cable to do CI-V with my IC-706 if I can find an 1/8" mono (male) to 1/8" stereo (...
3
votes
1answer
164 views

What cable is needed in order to record audio from a Baofeng UV-5x3 on a computer?

I would like to be able to connect my radio to my computer in order to record audio. It seems like this would just be a matter of getting the right cable, but after trying a few cables (listed below), ...
6
votes
4answers
133 views

Is there any downside to consolidating on BNC connectors for HF?

I'm new to ham and quickly finding that the new and old equipment I'm accumulating at an alarming rate has an equally alarming array of connectors: UHF PL-259 BNC SMA Type N Is there any downside to ...
2
votes
3answers
129 views

Connecting TNC-Pi to Kenwood TM-241A

I am looking into connecting a TNC-Pi to a Kenwood TM-241A for AMPRNet operation. I thought it was going to be fairly straightforward as each pin on the TNC-Pi seemed to have its own analogue on the ...
4
votes
3answers
161 views

Radio stops receiving as soon as the antenna is threaded all the way

Is it normal for the antenna conector of the radio to have 18ohm resistence between the inner socket(signal) and the thread (ground)? When I connect the antenna works fine if only the inner plug ...
8
votes
1answer
175 views

How terminate RG8 coaxial cable using PL259 (UHF) - screw - gasket - solder type?

Today I came across a problem in terminating RG8 cable using this PL259 plug. I have never had this type and it arrived in a pile of parts; I have tried to puzzle it together but without positive ...
5
votes
1answer
176 views

What is this connector?

It is the size of a BNC but has threads. For an RF output. I need to adapt it to SO-239. ---------------------------------------------- Tip o' The Hat to Glenn and Scott. TNC it is. This cable ...
0
votes
1answer
279 views

Yaesu FT-450D How to troubleshoot problems with the Keyer jack

I am a big fan of the Yaesu FT-450D but there is one really frustrating quirk that took some time to figure out. The FT-450 has a keyer jack on the front panel. It is the lower of two 1/8 inch ...
10
votes
1answer
116 views

Is there a special name (and if so what is it) for this flush-style SMA variant?

I have some radios that have a special antenna connector. It looks like an SMA connector, but the dielectric is flush with the end of the connector: rather than recessed the way "normal" SMA ...
1
vote
3answers
483 views

SMA connector sizes

So, I'm currently tinkering with a RTL SDR dongle and want to put an external antenna in the proper way (i.e. not by soldering a random wire on the included mcx terminated coax) I was about to buy a ...
5
votes
3answers
205 views

What kind of antenna connector is this?

I'm looking for antennas to attach to my CB radio. This one is a "rubber ducky" antenna. I'm not sure what the connector is, can anyone identify it for me? [edit] Here are some other pictures
3
votes
2answers
146 views

Identify this “large TNC” coax connector

I have recently acquired a nice looking dummy load on military surplus sale. Being relatively new to the hobby, I assumed the connector on it was something common. Turns out it is not. So far nobody ...
4
votes
2answers
158 views

Antenna connector name

What is the name of this antenna connector on the Kenwood TH-F6A?
1
vote
1answer
79 views

Ramsey's DDF1 with a SMA connector

Need some help with my Ramsey DDF1. It comes with telescopic antennas and my son has accidentally stepped on and broken one. I'm taking the opportunity to replace them with a SMA connector and ...
0
votes
1answer
62 views

Magnetic antenna for the UV8000E

I have the new UV8000E ht and I'm trying to find a magnetic antenna or at least the adapter that allows the unit to be attached to a pl259 connector. I have no clue what the connector is other than ...
0
votes
2answers
220 views

How to substitute a U229 connector?

The rig I'm possessed of is a homebrew from a fellow ham in a manpack case (GE524). The audio connector is a 5-pin 3-point all-weather bayonet mount from the heritage of the manpack. The ...
1
vote
5answers
684 views

How do I separate dovetailed PowerPole housings?

Anderson PowerPole connector housings can be joined side-to-side using dovetail joints molded into the plastic to make a multi-conductor connector, as seen in the conventional amateur radio 12V power ...
3
votes
3answers
422 views

On Anderson Powerpoles, does the red on go on the left or right?

When attaching a red and black pair of Powerpoles together, which way should I do it to ensure that it will plug into the most number of other people's gear? When looking from the top of the ...
2
votes
2answers
434 views

Measuring Connector Impedance

Before discovering that connectors can have characteristic impedance, I ordered a bunch of adapters. I've noticed that I'm getting really sub-par performance out of the antennas I'm using and think I ...
1
vote
2answers
8k views

Does the Baofeng UV-5R accept both male and female SMA connectors?

Most antennas for the Baofeng UV-5R have male connectors, but the UV-5R actually has a larger diameter set of threads that look like they'd accept a female connector. Is that true? Is it a female SMA, ...
6
votes
3answers
258 views

What is this large, flat microwave coaxial connector?

I picked up a random piece of RF hardware at a flea market. I'd like to know what these unusual connectors on it are. The jack is flat on its face except for the gold ring. Inside the gold ring ...
3
votes
1answer
113 views

Can I use an RG-8X crimper/stripper on LMR-240?

From all my reading online it seems LMR-240 and RG-8X are only about .002 inches apart in diameter and most connectors/tools that support one support the other. I'm looking for a crimper and stripper ...
4
votes
2answers
2k views

How to hook up my computer's audio output to my CB Radio?

I own this simple CB Radio: http://www.cbforumas.lt/upload/manuals/alan/alan_42_um.pdf I would like to connect its 2.5mm microphone jack and my computer's 3.5mm audio out jack. I have tried simple ...
8
votes
2answers
9k views

What's the pinout for “Kenwood” 2.5mm TRS/3.5 mm TRS connector?

I've seen many Chinese HTs (Baofeng, Puxing, Wouxun, QuanSheng etc.) using the so-called "Kenwood connector", which has a 2.5 mm TRS connector and a 3.5 mm TRS connector. It looks something like this: ...
3
votes
4answers
3k views

Why are some electrical connectors silver plated?

Silver is pretty expensive. Unlike gold, it will tarnish in air. Why then would anyone bother to plate connectors with it? Does it have some unique electrical characteristics that make it useful?
4
votes
7answers
8k views

Why are some electrical contacts gold plated?

Gold is really expensive. Why then would anyone bother to plate connectors with it? Does it have some unique electrical characteristics that make it useful?
4
votes
2answers
3k views

How do I extend broken coaxial cable?

I have a piece of 75 ohm coaxial cable of unknown type (outer diameter is around 7 mm) which has developed a breakage in the center conductor (which is stranded). This cable is an adapter cable which ...
1
vote
1answer
222 views

What is this RF connector?

And what will I need to mount it in my wall? I'd like to mount it similar to the below images in my wall. Will I need any additional adapters/converters? So to put all my questions in one place: ...
4
votes
1answer
1k views

What are the most common RF connectors encountered in amateur radio? [closed]

SO-239, PL-259, UHF, NMO, SMA male/female, reverse SMA, oh my! Some of these may even refer to the same thing with different names. Can someone list the most common connector types and show a picture ...
8
votes
3answers
2k views

Why do so many HF transceivers use a UHF connector?

Just looking around at various rigs online for a fiend. Lots of them look really attractive TS-480, K2, K3, FT-450D, FT-950, IC-78, FT-897 to name just a few... These rigs are mostly HF, albeit some ...
5
votes
2answers
2k views

Pros/cons of the PL259/SO239 connector (M type)?

What are the pros/cons of the PL259/SO239 connector (M type), and why is it used preferentially on civilian rigs vs military?
7
votes
1answer
1k views

Power limit of 50 ohm BNC connector?

Is there a limit to the power a 50 ohm BNC connector can handle?
3
votes
4answers
133 views

When should an adapter be used to marry a coax to a connector?

A quick follow-up to What should I consider when choosing a coaxial cable? Most commercial rigs come with a PL259/SO239 connector for use with something like the RG8/RG11. In the event the diameter ...