[Scan-DC] Compact CB Radios
Andrew Clegg
andrew_w_clegg at hotmail.com
Mon Mar 8 17:09:49 EST 2021
The CB Radio Service is limited to 4 W mean carrier power for AM, and 12 W peak envelope power for SSB. However, there are no limits on antenna gain so there is no regulatory EIRP limit for CB. The highest practical gain of a reasonably-sized CB antenna is probably around 15 dBi, so that's an EIRP of about 125 W in AM mode and 380 W in SSB. Not too shabby if you don't mind having a monster beam on top of your house.
The current rules don't seem to allow digital transmission on CB: "only AM voice emission type A3E and SSB voice emission types J3E, R3E, or H3E." Maybe the rules could be changed or at least clarified. 4 W or 12 W would be plenty for CW, WSPR, and all sorts of other cool digital modes.
________________________________
From: scan-dc-bounces at mailman.qth.net <scan-dc-bounces at mailman.qth.net> on behalf of Alex Fraser <beatnic50 at gmail.com>
Sent: Monday, March 8, 2021 4:32 PM
To: scan-dc at mailman.qth.net <scan-dc at mailman.qth.net>
Subject: Re: [Scan-DC] Compact CB Radios
I have not heard much on the "Chicken Band" lately. A couple of years
ago I managed to test PSK31 on 2 SSB radios I have in my collection. I
used a dummy load for an antenna and had the rigs right near each other
so I wouldn't get the government suspicious. It worked great. I put
the data in the mic input with a separate connector I made up and puled
the audio into my PC from the speaker output jack, both routed through
an inexpensive kit with Isolation transformers. I had a switch for TX
and RX.
Point is that if the band is not being used, then perhaps it should be
opened up for experimenters. At 5 watts I'm not sure how far you could
reliably communicate. Probably two stations with 100' towers and beams
could talk without skip over 20 plus miles, but I'm not sure. Using
some of the new digital modes might work out, but they are slow and not
good for just chatting. If you ain't worried about efficiency and more
concerned with having fun, let's do it.
On 3/8/2021 3:52 PM, Greg Danes wrote:
> Then if it is little used, why not a regional Scan-DC talk group (us)? It
> does not have to be a formal net. Since some of us are in Arlington,
> Bethesda, Baltimore, Fairfax etc. We could assign a working channel for
> each locale.
>
> It would pretty much make like minded go scanner folks able to discuss
> stuff without need of a HAM ticket.
>
> KJ4DGE
>
> On Mon, Mar 8, 2021, 3:10 PM <along at comcast.net> wrote:
>
>> Last time I had a listen to anything in the CB band there was a lot of
>> nothing in English and a lot of chit chat in Spanish and other foreign
>> languages. The most you'll hear from truckers is on the interstates and as
>> Dewey already mentioned that's even drying up.
>>
>> Andy
>> KE8QHA
>>
>> -----Original Message-----
>> From: scan-dc-bounces at mailman.qth.net <scan-dc-bounces at mailman.qth.net> On
>> Behalf Of Dewey
>> Sent: Monday, March 8, 2021 2:46 PM
>> To: 'Scan DC' <Scan-DC at mailman.qth.net>
>> Subject: Re: [Scan-DC] Compact CB Radios
>>
>> As a radio hobbyist who frequently travels, I still like to run a CB when
>> on
>> the road. Problem is, CB is pretty much dead now, even on the highways.
>> Sure, you *may* hear a conversation once in a while, but even at crash and
>> other event scenes, there is extremely little reporting going on... at
>> least
>> on this side of the Mississippi (smokey reports are almost non-existent).
>> I
>> find more local chatter, such as, dump trucks on their talking to their
>> co-workers than anything else. When stopping at truck stops, all of the
>> truck drivers I see are wearing single-sided Bluetooth headphones to their
>> cellphones. I've actually scanned the complete CB band when on the road
>> with nothing but miles and miles of silence. This is just an opinion, but
>> my belief is that in addition to cellphones killing CB (I'm sure most of us
>> remember good ol' REACT), the proliferation of GPS tracking has also slowed
>> a number (not all) of truckers down, thus eliminating the need for CB and
>> its most famous... smokey reports.
>>
>> Dewey
>>
>> -----Original Message-----
>> From: scan-dc-bounces at mailman.qth.net <scan-dc-bounces at mailman.qth.net> On
>> Behalf Of Alan Henney
>> Sent: Saturday, March 6, 2021 01:33
>> To: Scan DC <Scan-DC at mailman.qth.net>
>> Subject: [Scan-DC] Compact CB Radios
>>
>> With less and less to monitor on VHF and UHF, I was thinking about trying
>> the old CB radio band again.
>>
>> I noticed that the inexpensive radio manufacturers have some new offerings,
>> small and petite. These could easily fit in almost any auto.
>>
>> Has anybody tried something similar to one of these? What do you think?
>> What about any interesting modifications? How well do they scan?
>>
>>
>>
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>> 70156627
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