14 votes

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

The Baofeng UV-5R and any other variations in the UV-5R family of radios have an SMA male connector on the radio mating to an SMA female antenna or SMA female adapter. In the picture I'm holding the ...
Craig K's user avatar
  • 377
13 votes

How do I separate dovetailed PowerPole housings?

Firstly, there's a hole for a locking pin in the connectors. The pin prevents the connectors from sliding apart. If there's a pin in there, you'll need to push it out with a punch. If there isn't a ...
Phil Frost - W8II's user avatar
13 votes
Accepted

PL-259/SO-239 vs N Type vs BNC which is best connector to use when?

For shortwave listening, it doesn't really matter – all these connectors are suitable for 30 MHz, and for reception you don't need to work with significant power. PL-259 2m-band If you, however, plan ...
Marcus Müller's user avatar
11 votes
Accepted

What is inside a 50 ohm termination?

It depends on the frequency range the termination is rated for, and the power handling required. High power and high frequency is very difficult. At HF, any old non-inductive 50 Ω resistor will do. ...
tomnexus's user avatar
  • 11.2k
9 votes
Accepted

What kind of antenna connector is this?

I can't tell for sure without better pictures, but that looks like, not an RF connector per se, but a 3/8"-24 stud. This is very common for CB antennas. The reason I say it is not an RF connector is ...
Kevin Reid AG6YO's user avatar
  • 24.5k
8 votes
Accepted

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

It is known as an SF style SMA connector. It is also commonly known as a Motorola SMA connector since they seem to be one of the few large scale users of this style connector You can find some ...
Glenn W9IQ's user avatar
  • 18.6k
7 votes
Accepted

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

No, the UV-5R will not accept a female connector. The threads on the outside are for the nut that mounts the connector to the case.
Richard Hum's user avatar
7 votes
Accepted

What is this connector?

It looks like a female TNC connector.
Glenn W9IQ's user avatar
  • 18.6k
7 votes
Accepted

How do you solder/crimp a 90-degree BNC connector?

You strip the coax to fit, and solder the pin to the coax. Don't leave any wire sticking out past the pin. You don't and can't crimp it. Here's a video I found of a similar connector. If your iron ...
tomnexus's user avatar
  • 11.2k
6 votes

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

From http://rallynotes.com/2017/03/12v-anderson-powerpoles/: This is a good image for orientation reference.
epx's user avatar
  • 61
6 votes

Antenna connector name

Yes, that is a standard Female SMA connector. Heads-up to be careful when purchasing SMA antennas as there are several combinations. Most higher-end HTs have a standard Female SMA connector on the ...
Christiaan Adams's user avatar
6 votes

What is this BNC-type radio connector about 13mm diameter?

That looks like a Type-C RF connector. Pic from wikipedia
mike65535's user avatar
  • 1,035
5 votes
Accepted

Antenna connector name

That is a standard female SMA connector.
Glenn W9IQ's user avatar
  • 18.6k
5 votes

Why are some electrical contacts gold plated?

Gold plated contacts provide reliable switching when the wetting current is low, because there is no oxide to breach for electrical contact to occur. Ex: a pushbutton switch used to signal a ...
AlmostDone's user avatar
5 votes

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

PL-259 I'd really stay the hell away from PL-259. Undefined wave impedance, different manufacturer conventions, adapter stock of either decades of unknown storage (potentially in some moldy military ...
Marcus Müller's user avatar
5 votes

What is this (dangerous) connector type that looks like SMA?

It would be interesting to see a closer photo of the centre conductor hole. Is it possibly an adapter with the (partly hollow) centre pin of another SMA connector broken off inside it? Or do the ...
tomnexus's user avatar
  • 11.2k
4 votes

Why are some electrical connectors silver plated?

(I'm a retired USN Electronics Tech.) This is what they taught us about why the Navy chooses silver over other options. The oxides (aka tarnish) that forms on silver in air is nearly as conductive as ...
PCBonez's user avatar
  • 41
4 votes

Why do so many HF transceivers use a UHF connector?

The "UHF" connector, as stated, is a hold-over from World War II, and has become an industry standard. A lot of hams "know" how to put them on coax, and, since radio is, overall, forgiving, most don't ...
GerryC's user avatar
  • 41
4 votes
Accepted

SMA connector sizes

Is it ok to get a bunch of RG-58 sized connectors so that thinner types of coax will fit as well? Not if you want to do it right. Proper termination of coax requires a smooth transition from the coax ...
Phil Frost - W8II's user avatar
4 votes

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

I avoid UHF connectors as much as possible. My shack is all Type N outdoors (weatherproof) and all BNC indoors. UHF connectors work fine for HF and even above that. But I hate connectors where you ...
Walter Underwood K6WRU's user avatar
4 votes

How do I know if my coax connectors are good?

So, what your measurement indicates is two things: yep, the thing is somehow connected. The deep dips in the return loss are points when the characteristic impedance of the connector+cable+connector+...
Marcus Müller's user avatar
4 votes
Accepted

How to choose antenna "pigtail" pragmatically?

BNC is fine. SMA is probably more common in this application, but BNC is widely available, and easier to swap around than SMA. Since this is receive-only and the pigtail will be short, coax loss isn't ...
hobbs - KC2G's user avatar
  • 12.4k
4 votes
Accepted

loosening frozen coax connectors

If there are adapters frozen on the end of the cable, it's probably best to just cut the whole thing off and reterminate the cable with a new end. The reasoning is: Strenuous mechanical attempts to ...
user10489's user avatar
  • 6,230
3 votes

How do I separate dovetailed PowerPole housings?

The Anderson power pole connectors I had to dismantle were not easy to disassemble by hand. (They were not glued, nor did they have a roll pin.) Using the instructions provided by this website (black ...
Fred's user avatar
  • 31
3 votes

How do I separate dovetailed PowerPole housings?

The question asked about separating the plastic parts of a PowerPole connector with more than one conductor. Other answers talk about this. If you want to further break apart the connectors, follow ...
user20554's user avatar
3 votes
Accepted

How do I separate dovetailed PowerPole housings?

Individual PowerPole housings are in fact easy to separate by hand, assuming they are not locked together in some way. The reason I found it hard is that the first time I experimented with using the ...
Kevin Reid AG6YO's user avatar
  • 24.5k
3 votes

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

It's best to simply get the connector sized for the cable. PL-259 connectors are available for any cable size. To put one on RG-58, there are adapters such as Amphenol 182107: These slide over the ...
Phil Frost - W8II's user avatar
3 votes

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

The origin of this connector is Kenwood. We work with Kenwood and build custom headsets for Kenwood. This link is pretty much up to date and definative. https://www.wildtalk.com/knowledge-base/kenwood-...
Bivviboy's user avatar
3 votes

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

FWIW: The Baofeng UV-5R HT supplies 3.3V through 100(*) ohms on the tip of the 3.5mm connector, not 5V as documented above. Also, the PTT is pulled up thru 10K to 3.3V, and the MIC+ connection line ...
wpns's user avatar
  • 31
3 votes
Accepted

Measuring Connector Impedance

You can look at them. The characteristic impedance of a coaxial transmission line or connector is a function of the geometry of the conductors and the dielectric between them. Connectors are ...
Phil Frost - W8II's user avatar

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