HEY Guys!!!!!
             OK I'm seeing lots of regs. now what....obviously 49 mhz
is being used in the UK for other things besides personal
communications...Isn't there a 4 meter band located in the 70mhz
band?......Yea that's very unfortunate that The WORLD FREQS are not
coordinated together........Maybe this Group should be called 49MHZ
OR BUST!!! lol......set up of something right on 50 mhz might bring
it in line with the rest of us...What are the regs for operation just
below...say 49.995 mhz in UK and North America?....Mike va3mjw

-----Original Message-----
From: "devilsradio" <devilsradio@...>
Date: Sun, 24 Feb 2002 13:51:41 -0000
To: 49megahertz@yahoogroups.com
Subject: [49MHz] Where no Man has Gone Before ???

49 MHz is used in the UK for hospital and other on-site paging services (as well
as low power devices). A lot of 49 MHz isn't used by anyone because of VHF TV on
49.75 MHz from eastern Europe, it can be very strong in summer. 49.5 - 49.82 and
49.98 - 50.00 are not used by any service I can think of, nothing shown in any
frequency guide. Unfortunately we have very little freedom of information and
are not allowed to find out who does use a certain non-amateur frequency (or
listen for activity). Unlike the USA, our national frequency database is secret.

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-----Original Message-----
From: "rb@..." <rb@...>
Date: Sat, 23 Feb 2002 20:00:48 -0500

> Sec. 15.235  Operation within the band 49.82-49.90 MHz.
>
>     (a) The field strength of any emission within this band shall not
> exceed 10,000 microvolts/meter at 3 meters. The emission limit in this
> paragraph is based on measurement instrumentation employing an average
> detector. The provisions in Sec. 15.35 for limiting peak emissions
> apply.

10 mV/m at 3 metres on 49 MHz is around 100 microwatts ERP.

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HEY Guys....
             If we are going to play within these freqs...49-
51mhz....and with low power..it would make more sense to use cw
mode....or a reasonable factsimole( code sender )...I will leave some
inquiry msgs. on QRZ...and DX zone.com to find some complete
information on 49mhz to 6m conversion....Doesn't Maxon make a 49mhz
radio that runs more than mws????......And there would have never
been the 11 m experience , if hobby radio operators didn't take the
chance and work dx contacts over 27.405 ( no insult to mr.
Hollingsworth).....I've been trying to learn code so I can get into
the lower freqs...this may be the ticket.....Mike va3mjw

From a portion of: http://home.att.net/~weatheradio/part15.htm


VHF "Low-Band" or 6 Meters (49.82 - 49.9 MHz) Part 15 Stations

KEY:

6 Meter Part 15 operations are subject to the regulations of Section 15.235
which stipulate the following rather unusually strict limits: field strength
not to exceed 10,000 uV (10 mV) /meter at 3 meters (~10 feet), measured using
an average detector (this means modulation is included, making FM the most
advantageous voice mode); the total power input to the entire device (not
just finals but the whole unit) must not exceed 100 mW including modulation
(again FM is to be preferred for this reason), the antenna must not exceed 1
meter (3.28 ft.) in length (not height) and must be permanently attached to
the transmitter and of course out-of-band emissions must be attenuated to 20
dB down or better (if within 10 kHz of a band edge, 26 dB or better), and
operating bandwidth including sidebands must lie wholly within the band.

Any mode may be used (there are no provisions to the contrary) except that
cordless telephones are not permitted to operate under the provisions of this
Section. They may still operate in this band, however, but in accordance with
their own Rule part (15.233). Children's toy walkie-talkies and baby monitors
also operate here, as well as R/C car and plane controllers (although on the
bright side, all the above also make for readily available sources for
inexpensive transmitters or parts). Radio Shack is one potential source for
such rigs. CW esp. QRSS would be best for weak-signal DX, and as recommended
above, FM should be used for voice operations.

Receiving is a whole other story: the low-noise GaAs FET preamps familiar to
EME operators and large Yagi antennas or arrays will likely be needed to
maximize the potential of this range. Propagation here is identical to that
in the amateur 6 meter band (50 - 54 MHz); an unusual and fascinating melange
of both HF and VHF-like characteristics, a kind of 'transition band' if you
will. Because of this, at any given time there is likely to be some anomaly
or another which will make for interesting DX potential. Ionospheric
propagation modes such as F-layer reflection, transequatorial propagation and
sporadic-E skip are present here with F-skip most prevalent in peak sunspot
years, giving rise to worldwide DX possibilities; but so are tropospheric
ducting and refraction, meteor scatter, aircraft reflection, and other more
VHF-like modes. Ionospheric E-skip or sporadic-E is most prevalent in the
seasons of the longest and shortest days of the year (midsummer and
midwinter) with the summer openings being more frequent and stronger.
Tropospheric refraction is also most prevalent in the summer months with
temperature inversions being the cause.

Apparently at one time there was much experimental activity here but it has
long since died out. According to a recent post by Les Rayburn, N1LF (of
LOWFER/MEDFER "XMGR"/"XM"): "...Just got in a batch of back issues of the
VHF/UHF Digest (Official Publication of the Worldwide TV-FM Association). In
the March 1991 issue, there is a full page ad for "The Association to Promote
49MHz"...According to the ad their aim was to promote interest in the 49MHz
band. The club issued unique W49 and K49 identifiers, similar to callsigns,
to all members. They also published a journal and a directory of active
stations. The publisher was Michael Goetsch of Lakewood Ohio...It would be
interesting to see what kind of results these guys had on the band." However,
interest is now being revived, perhaps in part because of our present good
sunspot conditions and also because of a need for a band which performs in
the summer as well as LF does in winter (as mentioned, VHF sporadic-E and
tropo modes are most prevalent in the warmer months). Also, in light of the
recent major strides made in weak signal modes, this band, as well as any
other Part 15 segment can now be used to greater advantage than was ever
before possible.

More activity is expected here from the LOWFER/MEDFER community very soon, as
per much discussion on the LOWFER Reflector. These stations have been dubbed
"49ers" so following the LOWFER/MEDFER/HIFER convention in this site,
experimental beacons will be so designated.


49.8525 (49er) "NC", Stanfield, NC. Operated by Dexter McIntyre, W4DEX of
LOWFER, MEDFER and HIFER "NC" reknown. This is the first 49er in operation:
on air 06/06/01. CW mode. Hours opn.: during E-skip openings (which might
occur at any time, thus the frequency is designated here in bold). Dex sez:
"...I could only get 50% efficiency from the old Western Electric transistor
so it's 50 mW output until someone helps me with a more efficient
design....The directly attached antenna is a [1] meter whip loaded with a 40
- 50 MHz Larsen mobile coil with one added turn to get the required whip
length to resonate....Presently the signal source is a synthesized generator. 
  I plan to replace it with a crystal oscillator when I get one to operate
stable enough for QRSS. Keying is synchronized with NC Hifer and MedFER as
the keyer is common to all beacons running 3 dot second QRSS. I probably
won't run this beacon continuously until a crystal oscillator is used.  I
monitor the 6 meter [amateur] band just about all the time and am usually
aware of sporadic E openings.  As soon as I hear any E skip signals on 6
meters I will crank up the 49er if it isn't already on." We wish Dex good
luck!


-- Rob





-= rb@... =-

On Saturday 23 February 2002 08:11 pm, you wrote:
> Thanks! But according to these rules, almost every corldess phone and toy
> walkie-talkie ever produced breaks FCC regs!!!


Yeah, Michael, I know. I was just responding to the fact that the original
message said nothing was mentioned on the FCC site.

Personally, I think it would be fun to see some DX going on here. In the days
before cordless phones, there use to be some folks down in Florida running
radiotelephones (illegally) that could be heard here in New England. They
used freqs up in the 47-48 MHz range.

- Rob



-= rb@... =-

I haven't noticed any mention of this in the archives but one idea for use of
a 49 MHz device could be for a 6 meter beacon. These beacons are used for
propogation purposes and could be easily adapted since all you need to do is
switch the carrier on and off for CW. Beacon bandplan is: 50.060 thru 50.080
MHz

I suppose that you could also do this at 49 MHz for the non-ham
experimenters. Its much noiser in that part of the spectrum but you may be
able to hear CW thru it.

There are lots of beacon keyer projects out there. Some are pretty simple
kits and I've seen one that will interface with a PC so the message can be
changed at will.

Some URLs:

http://www.solorb.com/elect/hamcirc/beacon/
http://ourworld.compuserve.com/homepages/drcp/beacon.htm
http://www.highnoonfilm.com/xmgr/
http://www.computerpro.com/~lyle/pc-keyer/pc-keyer.htm


- Rob


-= rb@... =-

Thanks! But according to these rules, almost every corldess phone and toy
walkie-talkie ever produced breaks FCC regs!!!
73 ... de Michael KB3HFP

On Saturday 23 February 2002 07:39 pm, you wrote:
> There isn't much mention of 49MHz on the FCC website at all, but I believe
> the power limit is in the mw's. It's all in the antenna, I guess. :) Don't
> think there's any other restrictions. Any comments from anyone? List is
> silent recently except for Mike.



Well, I just joined the list so I might as well make trouble! ;)

According to FCC rules:


Sec. 15.235  Operation within the band 49.82-49.90 MHz.

     (a) The field strength of any emission within this band shall not
exceed 10,000 microvolts/meter at 3 meters. The emission limit in this
paragraph is based on measurement instrumentation employing an average
detector. The provisions in Sec. 15.35 for limiting peak emissions
apply.


The maximum output measurement is 10,000 micovolts measured at 3 meters from
the antenna. No mention of output in milliwatts. From experience, this can be
anywhere from 10 mW to 50 mW actual RF output.


     (c) For a home-built intentional radiator, as defined in
Sec. 15.23(a), operating within the band 49.82-49.90 MHz, the following
standards may be employed:
     (1) The RF carrier and modulation products shall be maintained
within the band 49.82-49.90 MHz.
     (2) The total input power to the device measured at the battery or
the power line terminals shall not exceed 100 milliwatts under any
condition of modulation.


This limits output since it no device is 100% efficient, output will HAVE to
be under 100 milliwatts.


     (3) The antenna shall be a single element, one meter or less in
length, permanently mounted on the enclosure containing the device.


Antenna restriction is single element (usually means no coils or groundplane)
of less than 39.37 inches. Also must be mounted on the device itself - no
coax.


Now *if* you planned on following the FCC rules, then you are really
restricted to the above. If you move up to the six meter band, then regular
amateur radio rules (part 97) apply.

Of course, I won't complain if someone wants to beef their 49 MHz signal up
for "experimental" purposes. Don't interfere with legitimate communications
and it is highly unlikely that anyone else would complain either.

Complete FCC part 15 rules and regs are at:

http://www.access.gpo.gov/nara/cfr/waisidx_01/47cfr15_01.html


-- Rob





-= rb@... =-

There isn't much mention of 49MHz on the FCC website at all, but I believe
the power limit is in the mw's. It's all in the antenna, I guess. :) Don't
think there's any other restrictions. Any comments from anyone? List is
silent recently except for Mike.
73 de Michael ... KB3HFP

Hi mike....
             You got me thinking about this 49 mhz DX...with it's
close location to 6 m band...I don't see why it is not
possible........While I think there may be an fcc rule against
it...hmmmm, as long as we stay within the power requirements...We
could get away with it...what do you think????....Mike Welsh

BTW, what is the URL for the eBay auction you're looking at? Don't
worry, I don't want to outbid you, just wanted to check it out. 73 de
KB3H

If you don't want to bid on eBay, there's usually a large amount of 49 radios
w/keyer at Toys 'R Us! :)
73 ... Michael

Hi All!!!
          Looked at the file on the 6 m conversion......was not aware
that the little handies ..the fm units...were being used in
52.00.......the kiddie versions I have come accross have only one
crystal....( for simplex obviously).....this is great though if you
want to work a local repeater...and you would still need an older
model radio with a crystal recepticle......The info I have is dated
1980...and 1993....I wanted to find out what was being done on the cw
side of things.....and the fact that there are no local repeaters in
my area kinda puts a damper on that idea....I do see a pair of 49ers
on ebay , with code sender and may bid on them.....these look to be
older models as they have rod antennas...........If anyone can dig up
more info on this , i'd apreciate it....73' Mike

Hi Michael !!!
               You are right THE NEW tranceivers are synthisized, and
the multichannel rigs are to hard to work with.If you could find a 5
channel rig with  chrystals , you may be able to operate it...but it
would have to be set up for 52 mhz....and I'm not sure if the fm
versions will operate that high.What I have read is that the cheaper
single channel handies with the code sender are being used.These are
actually transmitting and receiving in AM mode....cw/AM???that works
perfect.as for the freq. ...I read that you should install at 50.070
chrystal which is near the end of the cw allowication ( and I guess
am phone is acceptable here.So what you got is a AM/CW 6m qrp
rig ....Now if you could get enough hams playing around your area
with these little babies ...what fun !!!....It is possible to work DX
with 1 watt or less on 6 meters.I read in an older issue of CQ , that
a ham clinched 200 grid squares ( and holds the record ) using less
than a watt.Now that's cool!!!...I guess though it took him 2 years ,
and a lot of patients.
               Dipoles are real easy to make...an old cb trick is to
get a lenth of coax ( try to keep it around 12 feet long if possible)
and with a piece of old extention cord...cut the length of the leg
you need.now pull the cord apart so you have 2 exact size
pieces......the coax should have spade lugs on one end...and srip the
ends of the cord and hardwire each peice to a different end on the
coax ( spaded end )tape up carefully with electric tape..and there is
your dipole.....the dipole should be cut to the exact freq...in this
case 50.70 =9 ft. 3 inches...or 2 legs each side 4 ft. 7 1/2
inches......as for a connector, I would take the antenna off, and try
to fit a tiny sma connector ( which is being used these days on the
smaller mini handhelds).....you may have to bore the whole a little
wider to fit the radio....connect the antenna wire to the
connector...and soldier a ground wire from the connector to somewhere
on the chasis of the radio......Now this is just theory...I hav,nt
built one yet...I'm trying to find an apropriate radio.sometimes the
crystal is soldiered to the board...I want one with a crystal
recepticle......Mike va3mjw

There's a file on converting kiddie walkie-talkies to 6m in the Files section
of the group website. It says you can change crystals, but I have never seen
a wt that uses crystals, just tuning knobs for 42-50. I'm working on
modifying a wt to 6m as well as trying to set one up for a dipole. The only
antenna connector on it is a simple metal piece, but I'm going to try to
solder(?) a connector on and build a dipole (if I ever get the time) It's
only 300mw but I'm trying to figure out how to amplify it. Any suggestions?
Michael
KB3HFP

HI ALL!!!
           My name is Mike (va3mjw) and I live in Eastern Ontario
Canada.....I accidently came accross this group in my search for info
on radio conversions on the WWW.I was wondering if anyone was aware
that some of the 49mhz kiddie walkie talkies were convertable to
6m....I have come accross some tech info , and it is a very simple
proccess...alas the most recent info was dated '93'.....does any one
have recent info on this?The last entry mentioned more
experimentation on the project...adding an amplification stage...and
further mods were planned...but that's where it stops.
           49mhz DX?...Hmmmm, never accured to me...maybe using
CW?...and a dipole, great idea..but how to connect it ?...How about
installing a chasis mount SMA connector, as these are being used on
the mini ht's companies are puting out these days.......Mike va3mjw

----- Original Message -----

From: Fbs1050@...

To: 49megahertz@yahoogroups.com

Sent: 26 January 2002 22:24

Subject: Re: [49MHz] 49MHz Net Idea

Okay, thanks for the info. In the U.S., the allocations are mainly 46-47,
49-50 for low power use, but in the UK, the general focus of the group would
be 49.82 - 49.98. BTW, does anyone have any advice on building a 1/2 wave
dipole for 49MHz (yeah, I know, I have no life at all. :)
73,
Michael
KB3HFP


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Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

Okay, thanks for the info. In the U.S., the allocations are mainly 46-47,
49-50 for low power use, but in the UK, the general focus of the group would
be 49.82 - 49.98. BTW, does anyone have any advice on building a 1/2 wave
dipole for 49MHz (yeah, I know, I have no life at all. :)
73,
Michael
KB3HFP

-----Original Message-----
From: Fbs1050@...
Date: Sat, 26 Jan 2002 13:26:24 EST
To: 49megahertz@yahoogroups.com
Subject: Re: [49MHz] 49MHz Net Idea


> Just a question... what is the 49MHz allocation in England. Here in the U.S.
> it's used for low power devices. There used to be a lot of cordless phones in
> the band, but now it's mainly dead.
> 73,
> Michael
> KB3HFP

In the UK 49 - 49.5 is allocated to on-site paging systems. 49.425 - 49.475 is
used for paging in hospitals.
49.5 - 49.8 isn't used for much
49.82 - 49.98 is the low power (10 mW or less) band for type approved equipment.
This includes walkie talkies and baby monitors. There were a few 'serious'
walkie talkies (you didn't need to pretend you were action man or barbie when
using one) but these have mostly been discontinued since the 8 channel PMR446
allocation was made available across Europe.
Cordless phones are on 31.0375 - 31.2125 (base) paired with 39.9375 - 40.1125
(mobile) in the UK. There is an allocation from 47.45625 - 47.54375 (mobile)
paired with 1.642 - 1.782 MHz (yes that's right 160 metres!) but no new phones
use this band.
Some baby monitors and walkie talkies operate outside the approved band but all
the ones available in high street shops are type approved.

Simon
NW England
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Just a question... what is the 49MHz allocation in England. Here in the U.S.
it's used for low power devices. There used to be a lot of cordless phones in
the band, but now it's mainly dead.
73,
Michael
KB3HFP

-----Original Message-----
From: "kb3hfp" <Fbs1050@...>
Date: Fri, 25 Jan 2002 20:42:39 -0000
To: 49megahertz@yahoogroups.com
Subject: [49MHz] 49MHz Net Idea


> Hey everybody, I just had a weird (but hopefully good) idea - I'm
> thinking about setting up a net on 49MHz where 49MHz hobbyists can
> talk to each other over the air next time 6 meters is open. For those
> who don't know, 6m is a licensed amateur radio band 1MHz up from
> 49MHz, so when 6m is open, chances are 49MHz is too. When a band is
> "open", it can be used to talk to a certain part of the world (or
> country) if you use the right antenna and frequency. Does anyone have
> any suggestions for frequencies, dates, etc.?
> 73,
> Michael
> Amateur Radio Operator KB3HFP
> 49MHz O

Unless you were to go miles from a town I can't see the usual low power devices
channels being any good for DX operation, with a 6 metre mobile aerial baby
monitors can be heard on high ground for up to 5 miles away.
There's 'freeband' operation around 49.250 using SSB in some parts of the world,
using modified amateur radio equipment. It isn't very common and I've never
heard of anyone here in the UK doing it.

Simon
NW England
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Hey everybody, I just had a weird (but hopefully good) idea - I'm
thinking about setting up a net on 49MHz where 49MHz hobbyists can
talk to each other over the air next time 6 meters is open. For those
who don't know, 6m is a licensed amateur radio band 1MHz up from
49MHz, so when 6m is open, chances are 49MHz is too. When a band is
"open", it can be used to talk to a certain part of the world (or
country) if you use the right antenna and frequency. Does anyone have
any suggestions for frequencies, dates, etc.?
73,
Michael
Amateur Radio Operator KB3HFP
49MHz O

Hello all,
<Stepping on soapbox> I was just wondering -- does anyone else use their
modded cordless phone as an intercom / P.A. system? If not, what do you use
49MHz for? When I bought my cordless phone for 49MHz use, I noticed that the
HT could control an "intercom" on the base unit. It also has a very loud
speakerphone, so when I want it to be a P.A. system, I put it in a good place
and turn up the volume. Then I just go into another room and operate from the
HT. Plus, when it's in intercom mode it's at VERY low power, so interference
is almost zero. I was just wondering what others used 49MHz for. <Stepping
off soapbox, slipping, falling, and walking away, muttering something about
49MHz.> :)
73,
Michael
KB3HFP

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the 49megahertz
group.

   File        : /2freqlist.txt
   Uploaded by : kb3hfp <Fbs1050@...>
   Description : A list of frequencies and suggested uses (calling frequencies,
etc.) Sort of like the Ham 'Considerate Operator's Frequency Guide' only
unofficial and for the 49MHz band

You can access this file at the URL

http://groups.yahoo.com/group/49megahertz/files/2freqlist.txt

To learn more about file sharing for your group, please visit

http://help.yahoo.com/help/us/groups/files

Regards,

kb3hfp <Fbs1050@...>

123 123

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the 49megahertz
group.

   File        : /qrp49rig.txt
   Uploaded by : kb3hfp <Fbs1050@...>
   Description : How to "modify" a cordless phone to make it a 49MHz rig

You can access this file at the URL

http://groups.yahoo.com/group/49megahertz/files/qrp49rig.txt

To learn more about file sharing for your group, please visit

http://help.yahoo.com/help/us/groups/files

Regards,

kb3hfp <Fbs1050@...>

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the 49megahertz
group.

   File        : /scanner-repeater.txt
   Uploaded by : kb3hfp <Fbs1050@...>
   Description : How to turn your 49MHz baby monitor into a scanner repeater - by
Bob Parnass, AJ9S

You can access this file at the URL

http://groups.yahoo.com/group/49megahertz/files/scanner-repeater.txt

To learn more about file sharing for your group, please visit

http://help.yahoo.com/help/us/groups/files

Regards,

kb3hfp <Fbs1050@...>

Enter your vote today!  A new poll has been created for the
49megahertz group:

What do you use 49MHz for?

   o Communicating with other hobbyists
   o Communications inside your house
   o Scanner repeater
   o For fun
   o HT use


To vote, please visit the following web page:

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Thanks!

Enter your vote today!  A new poll has been created for the
49megahertz group:

How often do you use 49MHz? (Not
including RC car or cordless phone
operatio

   o Every day
   o Every other day
   o Every week
   o Every month
   o Less than once a month


To vote, please visit the following web page:

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