• Get involved.
    We want your input!
    Apply for Membership and join the conversations about everything related to broadcasting.

    After we receive your registration, a moderator will review it. After your registration is approved, you will be permitted to post.
    If you use a disposable or false email address, your registration will be rejected.

    After your membership is approved, please take a minute to tell us a little bit about yourself.
    https://www.radiodiscussions.com/forums/introduce-yourself.1088/

    Thanks in advance and have fun!
    RadioDiscussions Administrators

Metal box/enclosure?

R

radiofish

I'm looking for a 10" x 10" x 4" high metal box with a lid or cover to house an AM/FM radio so that the radio will be shielded in a high RF environment (rack between 20kW and 30kW FM transmitters) at a transmitter site building. The AM/FM radio is to be used as an EAS receiver and fed by a shielded coax fed outside the building to a yagi antenna aimed at the LP1 FM.

Does anyone have suggestions where I could find such a box? Ammo box? Electrical supply store? Home Depot?
 
Most electrical supply stores have a large selection of steel boxes in various sizes with lids that are hinged or that screw on. Short of finding something second hand, this may be the least expensive route.

Middle Atlantic and Sescom both make a series of very professional looking rack mount chassis boxes but this would be more costly.

You'll probably want to add notch filters on the antenna line to filter out the co-located FM frequencies as most radios will overload in the presence of such high power stations, especially when an external antenna is used. I recommend the Fastrap series by Microwave Filter Company.

Depending upon how much RF there is in the bulding, you may even have to put filters on the ac power and audio into and out of the box.

Good luck!







> I'm looking for a 10" x 10" x 4" high metal box with a lid
> or cover to house an AM/FM radio so that the radio will be
> shielded in a high RF environment (rack between 20kW and
> 30kW FM transmitters) at a transmitter site building. The
> AM/FM radio is to be used as an EAS receiver and fed by a
> shielded coax fed outside the building to a yagi antenna
> aimed at the LP1 FM.
>
> Does anyone have suggestions where I could find such a box?
> Ammo box? Electrical supply store? Home Depot?
>
 
I would really recommend against using a cheapo receiver at a site like that. You will most likely have nothing but trouble with it. I would suggest that you try (budget allowing) a quality receiver made for hostile RF environments, such a one design to co-exist with a FM transmitter, like those used in a translator site.
My suggestion would be:
http://www.fanfare.com/ft1ap-sht.html

dave


> Most electrical supply stores have a large selection of
> steel boxes in various sizes with lids that are hinged or
> that screw on. Short of finding something second hand, this
> may be the least expensive route.
>
> Middle Atlantic and Sescom both make a series of very
> professional looking rack mount chassis boxes but this would
> be more costly.
>
> You'll probably want to add notch filters on the antenna
> line to filter out the co-located FM frequencies as most
> radios will overload in the presence of such high power
> stations, especially when an external antenna is used. I
> recommend the Fastrap series by Microwave Filter Company.
>
> Depending upon how much RF there is in the bulding, you may
> even have to put filters on the ac power and audio into and
> out of the box.
>
> Good luck!
>
>
>
>
>
>
>
> > I'm looking for a 10" x 10" x 4" high metal box with a lid
>
> > or cover to house an AM/FM radio so that the radio will be
>
> > shielded in a high RF environment (rack between 20kW and
> > 30kW FM transmitters) at a transmitter site building. The
>
> > AM/FM radio is to be used as an EAS receiver and fed by a
> > shielded coax fed outside the building to a yagi antenna
> > aimed at the LP1 FM.
> >
> > Does anyone have suggestions where I could find such a
> box?
> > Ammo box? Electrical supply store? Home Depot?
> >
>
 
I agree with Dave's comments about the importance of using a good quality stable receiver for EAS purposes. The Fanfare tuner is a good tuner but it is also extremely expensive and probably out of the range of most stations, at least for EAS work. I've found that Dayton Industrial http://www.daytonindustrial.com/
makes some reasonably priced tuners where you can set the frequency with dip switches and just forget them. The quality of these tuners is nothing to brag about but with external filtering they would probably work just fine in the application in question.

> I would really recommend against using a cheapo receiver at
> a site like that. You will most likely have nothing but
> trouble with it. I would suggest that you try (budget
> allowing) a quality receiver made for hostile RF
> environments, such a one design to co-exist with a FM
> transmitter, like those used in a translator site.
> My suggestion would be:
> http://www.fanfare.com/ft1ap-sht.html
>
> dave
>
>
> > Most electrical supply stores have a large selection of
> > steel boxes in various sizes with lids that are hinged or
> > that screw on. Short of finding something second hand,
> this
> > may be the least expensive route.
> >
> > Middle Atlantic and Sescom both make a series of very
> > professional looking rack mount chassis boxes but this
> would
> > be more costly.
> >
> > You'll probably want to add notch filters on the antenna
> > line to filter out the co-located FM frequencies as most
> > radios will overload in the presence of such high power
> > stations, especially when an external antenna is used. I
> > recommend the Fastrap series by Microwave Filter Company.
>
> >
> > Depending upon how much RF there is in the bulding, you
> may
> > even have to put filters on the ac power and audio into
> and
> > out of the box.
> >
> > Good luck!
> >
> >
> >
> >
> >
> >
> >
> > > I'm looking for a 10" x 10" x 4" high metal box with a
> lid
> >
> > > or cover to house an AM/FM radio so that the radio will
> be
> >
> > > shielded in a high RF environment (rack between 20kW and
>
> > > 30kW FM transmitters) at a transmitter site building.
> The
> >
> > > AM/FM radio is to be used as an EAS receiver and fed by
> a
> > > shielded coax fed outside the building to a yagi antenna
>
> > > aimed at the LP1 FM.
> > >
> > > Does anyone have suggestions where I could find such a
> > box?
> > > Ammo box? Electrical supply store? Home Depot?
> > >
> >
>
 
> My suggestion would be:
> http://www.fanfare.com/ft1ap-sht.html<

I was going to say-- What a waste that would be! I would definitely not go that route for an EAS setup.

-A


> I agree with Dave's comments about the importance of using a
> good quality stable receiver for EAS purposes. The Fanfare
> tuner is a good tuner but it is also extremely expensive and
> probably out of the range of most stations, at least for EAS
> work. I've found that Dayton Industrial
> http://www.daytonindustrial.com/
> makes some reasonably priced tuners where you can set the
> frequency with dip switches and just forget them. The
> quality of these tuners is nothing to brag about but with
> external filtering they would probably work just fine in the
> application in question.
>
> > I would really recommend against using a cheapo receiver
> at
> > a site like that. You will most likely have nothing but
> > trouble with it. I would suggest that you try (budget
> > allowing) a quality receiver made for hostile RF
> > environments, such a one design to co-exist with a FM
> > transmitter, like those used in a translator site.
> > My suggestion would be:
> > http://www.fanfare.com/ft1ap-sht.html
> >
> > dave
> >
> >
> > > Most electrical supply stores have a large selection of
> > > steel boxes in various sizes with lids that are hinged
> or
> > > that screw on. Short of finding something second hand,
> > this
> > > may be the least expensive route.
> > >
> > > Middle Atlantic and Sescom both make a series of very
> > > professional looking rack mount chassis boxes but this
> > would
> > > be more costly.
> > >
> > > You'll probably want to add notch filters on the antenna
>
> > > line to filter out the co-located FM frequencies as most
>
> > > radios will overload in the presence of such high power
> > > stations, especially when an external antenna is used.
> I
> > > recommend the Fastrap series by Microwave Filter
> Company.
> >
> > >
> > > Depending upon how much RF there is in the bulding, you
> > may
> > > even have to put filters on the ac power and audio into
> > and
> > > out of the box.
> > >
> > > Good luck!
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > > I'm looking for a 10" x 10" x 4" high metal box with a
>
> > lid
> > >
> > > > or cover to house an AM/FM radio so that the radio
> will
> > be
> > >
> > > > shielded in a high RF environment (rack between 20kW
> and
> >
> > > > 30kW FM transmitters) at a transmitter site building.
>
> > The
> > >
> > > > AM/FM radio is to be used as an EAS receiver and fed
> by
> > a
> > > > shielded coax fed outside the building to a yagi
> antenna
> >
> > > > aimed at the LP1 FM.
> > > >
> > > > Does anyone have suggestions where I could find such a
>
> > > box?
> > > > Ammo box? Electrical supply store? Home Depot?
> > > >
> > >
> >
>
<P ID="signature">______________
"...How can you be deaf, with ears like that??"</P>
 
Status
This thread has been closed due to inactivity. You can create a new thread to discuss this topic.


Back
Top Bottom