I'm wondering if the R-392 mobile rx was designed for a hi-Z antenna input,
since it would have been used with whips on a Jeep and the like.

If I'm running a big outside antenna thru a 52 Ohm coax into the radio, wuld I
be better off with some kind of matching xformer?
Tnx es 73, Mike K.

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r (Mike Knudsen) wrote in
:

I'm wondering if the R-392 mobile rx was designed for a hi-Z antenna
input, since it would have been used with whips on a Jeep and the
like.

I had a R-392. The BNC connector was for the Jeep type whip. Since this was
truly a field type radio, they included the universal antenna post for
hooking up any kind of long wire.

It would be an easy thing to pull the chassis out, and see if there is any
kind of impedance matching network off either of the 2 antenna ports.

Let me tell you, that thing is killer on the BCB with any kind of loop fed
into the BNC connector.

r (Mike Knudsen) wrote in
:

I'm wondering if the R-392 mobile rx was designed for a hi-Z antenna
input, since it would have been used with whips on a Jeep and the
like.

I had a R-392. The BNC connector was for the Jeep type whip. Since this was
truly a field type radio, they included the universal antenna post for
hooking up any kind of long wire.

It would be an easy thing to pull the chassis out, and see if there is any
kind of impedance matching network off either of the 2 antenna ports.

Let me tell you, that thing is killer on the BCB with any kind of loop fed
into the BNC connector.

r (Mike Knudsen) wrote in
:

I'm wondering if the R-392 mobile rx was designed for a hi-Z antenna
input, since it would have been used with whips on a Jeep and the
like.

I had a R-392. The BNC connector was for the Jeep type whip. Since this was
truly a field type radio, they included the universal antenna post for
hooking up any kind of long wire.

It would be an easy thing to pull the chassis out, and see if there is any
kind of impedance matching network off either of the 2 antenna ports.

Let me tell you, that thing is killer on the BCB with any kind of loop fed
into the BNC connector.

r (Mike Knudsen) wrote in
:

I'm wondering if the R-392 mobile rx was designed for a hi-Z antenna
input, since it would have been used with whips on a Jeep and the
like.

I had a R-392. The BNC connector was for the Jeep type whip. Since this was
truly a field type radio, they included the universal antenna post for
hooking up any kind of long wire.

It would be an easy thing to pull the chassis out, and see if there is any
kind of impedance matching network off either of the 2 antenna ports.

Let me tell you, that thing is killer on the BCB with any kind of loop fed
into the BNC connector.

In article , donutbandit
writes:

I had a R-392. The BNC connector was for the Jeep type whip. Since this was
truly a field type radio, they included the universal antenna post for
hooking up any kind of long wire.


Thanks for the post. I was wondering if the BNC connector might go thru a
low-Z network, compared to the good-old-fashinoed binding post.

It would be an easy thing to pull the chassis out, and see if there is any
kind of impedance matching network off either of the 2 antenna ports.

Easy to get the chassis out (and a delight to look at -- this radio is as
pretty inside as it is ugly outside -- kiss the frog), but might need a fiber
optic scope to see inside the antenna system. I'll take a look.

Let me tell you, that thing is killer on the BCB with any kind of loop fed
into the BNC connector.

That's nice to know! I haven't done much with hooking loops to radios not
intended for them, but I do have some around I could try. Get a LOT less noise
and static with a loop than a hank of wire, for sure. Tnx es 73, Mike K.



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In article , donutbandit
writes:

I had a R-392. The BNC connector was for the Jeep type whip. Since this was
truly a field type radio, they included the universal antenna post for
hooking up any kind of long wire.


Thanks for the post. I was wondering if the BNC connector might go thru a
low-Z network, compared to the good-old-fashinoed binding post.

It would be an easy thing to pull the chassis out, and see if there is any
kind of impedance matching network off either of the 2 antenna ports.

Easy to get the chassis out (and a delight to look at -- this radio is as
pretty inside as it is ugly outside -- kiss the frog), but might need a fiber
optic scope to see inside the antenna system. I'll take a look.

Let me tell you, that thing is killer on the BCB with any kind of loop fed
into the BNC connector.

That's nice to know! I haven't done much with hooking loops to radios not
intended for them, but I do have some around I could try. Get a LOT less noise
and static with a loop than a hank of wire, for sure. Tnx es 73, Mike K.



Oscar loves trash, but hates Spam! Delete him to reply to me.

The R-392 receiver was used with the T-195 transmitter to make up the
AN/GRC-19 system. The set was used either with a whip or a dipole depending
whether the unit was used stationary or mobile. The transmitter antenna
tuner is automatically switched over to match a whip or a coax-fed dipole
(50 ohms) depending on the antenna connector used ("N" connector or binding
post). The BNC antenna connector on the R-392 is connected with a short
length of coax to the T-195 transmitter antenna change over relay.
Whether it's a low-Z antenna (whip) or a 50 ohm coax, it's the same input.
The antenna trimmer in the receiver optimizes the match in either case. The
antenna binding post on the receiver is the same input as the BNC.

73, Meir WF2U

"Mike Knudsen" wrote in message
...
I'm wondering if the R-392 mobile rx was designed for a hi-Z antenna
input,
since it would have been used with whips on a Jeep and the like.

If I'm running a big outside antenna thru a 52 Ohm coax into the radio,
wuld I
be better off with some kind of matching xformer?
Tnx es 73, Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

The R-392 receiver was used with the T-195 transmitter to make up the
AN/GRC-19 system. The set was used either with a whip or a dipole depending
whether the unit was used stationary or mobile. The transmitter antenna
tuner is automatically switched over to match a whip or a coax-fed dipole
(50 ohms) depending on the antenna connector used ("N" connector or binding
post). The BNC antenna connector on the R-392 is connected with a short
length of coax to the T-195 transmitter antenna change over relay.
Whether it's a low-Z antenna (whip) or a 50 ohm coax, it's the same input.
The antenna trimmer in the receiver optimizes the match in either case. The
antenna binding post on the receiver is the same input as the BNC.

73, Meir WF2U

"Mike Knudsen" wrote in message
...
I'm wondering if the R-392 mobile rx was designed for a hi-Z antenna
input,
since it would have been used with whips on a Jeep and the like.

If I'm running a big outside antenna thru a 52 Ohm coax into the radio,
wuld I
be better off with some kind of matching xformer?
Tnx es 73, Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

In article , "WF2U"
writes:

The transmitter antenna
tuner is automatically switched over to match a whip or a coax-fed dipole
(50 ohms) depending on the antenna connector used ("N" connector or binding
post).

OK, so the different matchings wre done in the TX ant tuner. That makes sense.
I knew that the R-392 was part of a T/R setup, though I've never actually seen
a T-195. Must be as interesting inside as the R-392, and really crammed in!

The antenna trimmer in the receiver optimizes the match in either case. The
antenna binding post on the receiver is the same input as the BNC.

So as long as I get a definite peak with the Ant Trimmer, and not at one
extreme of capacitance, I'm probably matching properly to whatever antenna I'm
using. Last time I used the radio, it seemed to have a good double peak (not
an extreme), so I guess all is well.

I started this thread due to a similar discussion on the R-388 (high impedance
antenna input) versus the 51J-3 (allegedly low-Z link input). My schematics
for both those radios show a high-Z input, cap coupled to the top of the Ant
coil and the RF amp grid. --Mike K.



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