I have a Craig CR-4100 radio at my desk at work. It's surrounded by a
metal shelf work on the desk top. As a result, it picks up only 1 or 2
FM stations and no AM stations.

The radio's built-in antennas a

1. Internal bakelite AM antenna with NO external antenna input plug;
and an

2. External (on back of radio) extending metal pole FM antenna with NO
external antenna input plug.

I would like to add an active or passive external AM and FM antenna
that I can set on the top of the desk's metal shelf work and allow the
radio to pull in all the local AM and FM stations.

From the Usenet Newsgroup: rec.radio.shortwave, I would like the
following:

1. A suggestion for an external AM and FM active or passive antenna;
and

2. A wiring diagram that will describe how to install the external
antenna.

Thanks, in advance for your input in this matter.

Al Gershen
Grants Pass, OR, USA

On 12 feb, 08:21, aldg wrote:
I have a Craig CR-4100 radio at my desk at work. It's surrounded by a
metal shelf work on the desk top. As a result, it picks up only 1 or 2
FM stations and no AM stations.

The radio's built-in antennas a

1. Internal bakelite AM antenna with NO external antenna input plug;
and an

2. External (on back of radio) extending metal pole FM antenna with NO
external antenna input plug.

I would like to add an active or passive external AM and FM antenna
that I can set on the top of the desk's metal shelf work and allow the
radio to pull in all the local AM and FM stations.

From the Usenet Newsgroup: rec.radio.shortwave, I would like the
following:

1. A suggestion for an external AM and FM active or passive antenna;
and

2. A wiring diagram that will describe how to install the external
antenna.

Thanks, in advance for your input in this matter.

Al Gershen
Grants Pass, OR, USA

Hello,

For the wiring diagram and instructions, see Brenda Ann's excellent
response.

Regarding diminishing returns, relocate your receiver (or other
receiver) to a place where you can receive the stations you want (both
FM and AM), and that is appropriate to locate your antennas. When you
can find such a place, you can proceed adding the external antenna
inputs.

If you plan to install the antennas outdoor (that means cable will
enter the building from outside), make sure to follow local
regulations on safety (lightning).

For the FM antenna, a straight wire half wave dipole or folded dipole
(with 4:1 balun in it) will be fine if you can receive the stations on
a portable also (at the position of the antenna). Use 75 or 50 Ohms
cable to connect the antenna to your receiver.

For the AM antenna, a large single wire loop (about 1 square meter [11
square feet] may do the job. Also here, use 75 or 75 Ohms cable to
connect the antenna to the receiver. The loop must be oriented
vertically and has maximum reception in the plane of the loop.

If you are in an interference rich environment, you may need to insert
a balun (if not already present in the antennas), to reduce the effect
of interference generated close to the cables and receiver.

Note that antennas exist that may perform better, but complexity
increases more then proportional and success depends on several other
factors. I don't know the quality of the receiver, but using external
antennas may result in bad reception due to strong signal overload.

Best regards,


Wim
PA3DJS
www.tetech.nl
without abc, PM will reach me.

I have a loop antenna from an home system and want to wire it to a boombox any thoughts?

On Saturday, February 12, 2011 at 9:21:23 AM UTC+2, aldg wrote:
I have a Craig CR-4100 radio at my desk at work. It's surrounded by a
metal shelf work on the desk top. As a result, it picks up only 1 or 2
FM stations and no AM stations.

The radio's built-in antennas a

1. Internal bakelite AM antenna with NO external antenna input plug;
and an

2. External (on back of radio) extending metal pole FM antenna with NO
external antenna input plug.

I would like to add an active or passive external AM and FM antenna
that I can set on the top of the desk's metal shelf work and allow the
radio to pull in all the local AM and FM stations.

From the Usenet Newsgroup: rec.radio.shortwave, I would like the
following:

1. A suggestion for an external AM and FM active or passive antenna;
and

2. A wiring diagram that will describe how to install the external
antenna.

Thanks, in advance for your input in this matter.

Al Gershen
Grants Pass, OR, USA

On Sunday, March 4, 2018 at 8:47:16 AM UTC-6, wrote:
On Saturday, February 12, 2011 at 9:21:23 AM UTC+2, aldg wrote:
I have a Craig CR-4100 radio at my desk at work. It's surrounded by a
metal shelf work on the desk top. As a result, it picks up only 1 or 2
FM stations and no AM stations.

The radio's built-in antennas a

1. Internal bakelite AM antenna with NO external antenna input plug;
and an

2. External (on back of radio) extending metal pole FM antenna with NO
external antenna input plug.

I would like to add an active or passive external AM and FM antenna
that I can set on the top of the desk's metal shelf work and allow the
radio to pull in all the local AM and FM stations.

From the Usenet Newsgroup: rec.radio.shortwave, I would like the
following:

1. A suggestion for an external AM and FM active or passive antenna;
and

2. A wiring diagram that will describe how to install the external
antenna.

Thanks, in advance for your input in this matter.

Al Gershen
Grants Pass, OR, USA

Stick a wire on your cell phone and wrap the wire around your radio. It might work.

In article , writes:
= I have a loop antenna from an home system and want to wire it to a boombox any thoughts?
In article , writes:
Stick a wire on your cell phone and wrap the wire around your radio. It might work.

Except it might block (or worse) at the RF input every time the cell phone
went into transmit mode to check in with the tower. And don't even try
to _talk_ on that phone.

Still likely a better idea than thinking a loop antenna works for both
AM and FM.

Larry's right, though. Get a real AM antenna and try magnetic coupling
by wrapping a loop around the case. Or build yourself a loop large
enough to completely enclose your (plastic) boombox and see if it will
self-couple. Maybe mount it on a rotating vertical axis - antenna and
all on a lazy Susan, the radio elevated, possibly on blocks, above the
lower part of the loop.

FM's different. Some cheap systems use the cord as an FM antenna, some
have whip antennas. Try a random length of wire taped to the power cord,
or to the whip, for a few inches. Better yet: get a decent boombox with
an FM input and get a real FM antenna.

George

On Wednesday, March 7, 2018 at 6:26:19 AM UTC-6, George Cornelius wrote:
In article , writes:
= I have a loop antenna from an home system and want to wire it to a boombox any thoughts?
In article , writes:
Stick a wire on your cell phone and wrap the wire around your radio. It might work.

Except it might block (or worse) at the RF input every time the cell phone
went into transmit mode to check in with the tower. And don't even try
to _talk_ on that phone.

Still likely a better idea than thinking a loop antenna works for both
AM and FM.

Larry's right, though. Get a real AM antenna and try magnetic coupling
by wrapping a loop around the case. Or build yourself a loop large
enough to completely enclose your (plastic) boombox and see if it will
self-couple. Maybe mount it on a rotating vertical axis - antenna and
all on a lazy Susan, the radio elevated, possibly on blocks, above the
lower part of the loop.

FM's different. Some cheap systems use the cord as an FM antenna, some
have whip antennas. Try a random length of wire taped to the power cord,
or to the whip, for a few inches. Better yet: get a decent boombox with
an FM input and get a real FM antenna.

George

www.abc-lounge.com/fr ...See how easy that is.

On Wednesday, 7 March 2018 07:26:19 UTC-5, George Cornelius wrote:
Better yet: get a decent boombox with
an FM input and get a real FM antenna.

George

Can you name a SINGLE FM boombox with CD player currently on the market that has an FM antenna jack? I've only found one, and it has a TV on the front and is some Chinese brand I've never heard of (JWIN).