Tips and trick for the HR2510
Author: Josh Steele
JACK REVIEWS THE HR 2510
The following article was compiled from ,notes that brother
Jack passed on to me on conversations that we have had. This is
firsthand information that Jack gathered from his study of the
HR2510 when if first come off the production line.
As you know, the HR2510 is a mobile 10-meter transceiver radio
recently introduced into the market by the Uniden Corporation.
Rumor has if that if is easily convertible to on 11-meter radio,
but the manufacturer would never admit so that. Let me fell you,
however, that the rumor is definitely true.
This radio is hot!. It is so hot that distributors can't keep
the radio in stock. And, as Jack reports to me, Uniden can't
fill their orders to heir distributors. They cannot produce
enough the radios in the Orient. A large shipment was received
in the states recently, but it only mounted to a fraction of the
number that has seen ordered from the company.
The HR2510 is for the CBer who has verything. If can expand
your horizon into a hole new area. As Uniden's own literature
tates, it "opens up 10 Meters to more people that ever before."
If you're a lover of export radios, you'll love this unit. It is
an idea whose has come.
The begin with, the radio has a lot of outstanding features.
It is the only mobile radio we know of that has VF0 (variable
frequency output) control. The VFO works on transmit and receive
(the RIT control, however, only works on receive) and it will
allow you to change channels by 100 Hz to 1 KHz. It has built-in
roger-beep, built-in scan, and an automatic key. It has a
band-select that jumps fifty channels per scan which makes it
easy to find the action. There is a frequency lock that will
prevent you from getting off frequency if you accidentally hit
the channel knob. The lock blocks any changes from the P. L. L.
The radio's display reads out the channel as well as the
frequency. You have all the meters you need including SWR, RF,
modulation, and calibration. The radio has 10-watt power on the
AM and 25-watt on the sideband. It also has automatic squelch,
noise blanker and much more.
Of course, the real beauty of this radio is that happens to it
after it is converted. I would never encourage anyone to engage
in this illegal activity, but I will provide this information
for EDUCATIONAL PURPOSES ONLY for my readers who reside outside
of the United Stales. If the HR2510 is expanded to the 11th
meter band, this is what you get. The power output goes to 25
watt on the AM with slide up to 35 and 45 watts on the sideband.
You get every channel between 26.000 and 29.999! You don't miss
any! You can go straight through the band without skipping any
channels! (Contrary to rumors, you do not lose the 10 meters
offer conversion.) The scan feature that comes with the radio
will allow you to scan all 40 channels on the CB band. In
addition, after modification, the radio will allow you to jump
past all of the RC channels. In other words, if you flip the
channel selector to the 10 KHz mode it will jump through the C8
bond and skip lhe RC channels and give you a tru, channel
read-out. And as on extra added bonus, after this radio i
converted, you get automatic talkback
For what it is capable of, the HR2510 has very little
competition in the market. Its main competitors would be the
Galaxy and President Lincoln Export radios and the Ranger
AR-3500. And how does it stack up against those competitors.
Well, compared to the Galaxy, it has many more features, gets
many more channels and is more powerful. Since the Galaxy is on
illegal radio, the HR2510 is generally much easier to find.
As for the Ranger, it is more difficult to convert than the
HR2510 and more expensive. And it will skip channels. I agree
with my brother Jack, also, when he says that the Ranger is just
too gaudy. The HR2510 is a better looking radio.
PROBLEMS WITH THE PRESIDENT LINCOLN
The President Lincoln Export radio is the version of the
HR2510 that Uniden makes for sale overseas. It already has the
11th meter band. If is made to look and act like on HR2510 after
conversion. If falls short in the performance category. There
are problems with the reception cutting in and out and its
variable power output has a tendency to slide back on power.
Like the Galaxy, the Lincoln is illegal which makes it hard to
find and even harder to get anyone to service. To top if off, it
is more expensive the HR2510.
MORE STUFF ON THE HR2510
Let me add a note on the driver and final used in the HR2510.
The driver in the radio is the 2SC2166. This driver is completely
interchangeable with the
final found in most radios including the Cobra 2000GTL and the
Uniden 710E and it can handle up to 20 watts of power. The final
is the MRF477. It can handle about 50 watts of power. This is
further indication that the radio was built for power.
The radio has an AN612 balance modulator which is the same one
found in the Cobra 14BGTL. It uses a 10 MHz I. F. like the Cobra
146GTL. As a result, the receive is very similar to the 146. The
transmit is close to that of the Jackson Export, but instead of
using coils, like the Jackson, the 2510 utilizes a wide-band
toroidal transformer at outputs to eliminate tuning and to get
the wide bandwidths needed to operate the 26 MHz to 30 MHz.
One fascinating feature of the HR2510 is its use of several
circuit boards instead of the usual one circuit board found in
other radio. Next month, we will explore the purpose, use and
effectiveness of these boards. In coming months, we will try to
provide conversion information for our readers living outside of
the United States. Be looking for it.
As I said at the beginning of this article, this radio is
selling strongly. Uniden is doing al it can to keep its
distributors supplied, but can't quite keep up. So you may want
to order your supply now from your distributor.
One final note. The HR2510 does require a ham operator's
license for operation as an amateur radio. However, it is very
simple to gel one and that should not pose any obstacle to
someone who is interested in purchasing the unit.
Depression still gripped the' country. So my friend's grandpa
chose bootlegging as a profession and he did mighty well at it.
Of course, since bootlegging was so lucrative, the
competition in the market was fierce. Some of the competition
were not believers in the American free enterprise system,
however. ' They would hove liked to have had no competitors-
whatsoever. They wanted a monopoly and they were powerful
One night, my friend's grandpa was making one of his
deliveries up in the "hollers" somewhere. His competition look
the' opportunity to "liquidate" 11I5 (business. He was never
heard from again
Now, these competitors of his wanted to make sure that
everyone got the message, shortly after his "disappearance", his
wife, or should I say widow, received something in the mail.
Tucked in an envelope was her husband's ring finger.
Competition can get rough sometimes
THE HR2510 REVISITED
As I promised last month, we are going to provide the readers
with some technical information on the circuitry found in the
The 2510 has two main circuit boards. One is the P8121A8. This
board house a 5 volt regulator, an 8 volt regulator, and the
microprocessor. The microprocessor is the UC1170 DIP (Dual
In-line Package) chip and it controls the bandwidths, channels,
In effect, if controls the Whole radio. The PB121BA also
contains the 0305A, a serial PLL. which is fed directly by the
microprocessor thus avoiding the pin-jumping needed in older
radios. Modification is performed by programming the pins on the
microprocessor, allowing you to obtain the extra bandwidths you
want. Two 5042P mixer chips ore also on this board. These are
the same chips used on the 14BGTL. They do the mixing in the VCO
(Voltage Control Oscillator) and they make the VCO very stable.
The other main board, which is controlled by the
microprocessor, is the PB111AB. The MR477 final, the 2166 driver
and the AN612 balance modulator mentioned in last month's
article are located on this board. It also contains the complete
audio, receive and transmit circuitry. The audio IC chip is a
TDA1905, a full 7 watt IC DIP chip that is being used on all new
Uniden radios. It is somewhat unusual in that is a 14 -pin chip
rather than a flat pack, but it most work very well because
Uniden has been using it for some time. The receive uses a
455KHz IF (Intermediate Frequency) which gives you a crystal
filter for reception. The resulting narrower bandwidth causes
better rejection and helps prevent bleedover. The AMC (Automatic
Modulation Control) is handled by the VR114 variable resistor.
The VR104 variable resistor handles ALC (Automatic Level
Control). When fully cranked up, if con swing to 55 to 60 watts
at peak. The AM power control is a VR103 variable resistor.
The radio also contains several other smaller circuit boards
that perform specific functions.
The PB119A is the FM receiver board and enables the radio to
pick-up the FM frequencies.
The PB117AA is the noise blanker and AM detector board and if
allows operation on the AM band. There are different boards
because this is a multi-mode radio. To get the mode desired, the
appropriate board is plugged in and soldered into place.
The PB100A8 is the collector current adjustment board. You can
pull the board and put a current meter between each of the pins
to set up the bias an the finals.
The PB118AA SWR board has the SWR meter on it. Information is
sampled by this board and sent to the microprocessor. This board
determines what you see on the front of the radio.
The PB112 is the digital readout board. It has a IR2429 IC
chip on if which is the driver for the LCD display. It takes
information from the microprocessor and feeds it to the display.
Those are the most important boards in the radio. There are
several other subboards in the front of radio for volume
control, modulation selector switches and things like that, but
I'm not going to go into them here. I hope this information will
be helpful to my readers, particularly those who are ham
operators. I maintain that this is a lot of radio for the price.
You can certainly get more sophisticated equipment, but You're
going to have to pay for it.
Now, about the conversion of this radio. You know that is
illegal and I would never encourage my readers to engage in
illegal activities. But for my readers living outside the United
I will provide you with some information that Brother Jack
picked up recently. Of course, this information is all hearsay
because we all know that Jock would never actually alter a
radio himself. About all I can tell you for now is that there
are two methods of modification. One method has something to do
with pins 34 and 35 on the microprocessor. The other method
involves pin 36 in addition to 34 and 35. It is amazing how
much more you con find out with a self-addressed stamped
A ROUGH CHRISTMAS SEASON FOR BUYING ELECTRONIC PRODUCTS?
Last issue, we discussed the problems Cobra and Uniden were
having supplying their distributors with adequate quantifies of
the 2000GTL and the HR2510 respectively. Brother Jack reports
that the shortages my extend to other manufacturers and other
products. In foci, almost anything of an electronic nature
including scanners, VCRs, stereos, etc.., may be in short supply
this Christmas season. Most items of this nature, of course, are
manufactured in the Orient. Jack says the manufacturers cannot
get enough parts from their suppliers to enable them to maintain
sufficient production. Look for increasing prices as Christmas
A MOBILE ANTRON 99!
In the course of my work, I am fortunate to do a !lot of
travelling Recently, I stopped of a small diner in the Midwest
for lunch on my way home. Right after I sat down in my booth, I
saw meter, and RF/MIC gain, vofume/squelch, clarifier, SWR
calibration controls, among others.
Brother Jack reports that rumor has it that there is a kit
available for very easy conversion of this radio. The radio is
so new neither Jack nor I have had an opportunity to open it up.
As soon as we find out more about it, we'll fill you in on the
...I know of some people that have tried to make a base
station antenna and hove had very poor luck. Including myself.
We have used aluminium and fried to make them the some as you
buy, but we are not getting something tight. I would like to
make On omnidirectional like the pig stick..E.L., Paris, TX
It is difficult to advise you based on the information you
provided. I would want to know, for example, what type of radio
you had, what kind of talking you prefer to do, what your
physical surroundings are like, etc.. But for all the time,
effort, and money you are going to have to invest into such on
enterprise, you might be better off staying with an Antron or
Big Stick, If you can get them at reasonable prices. The Antron
is a great antenna for the money and it has 9.9 dB gain.
I...was impressed on your article about the Uniden 2510. I
have converted several of these radios, but I can only get 12
to 15 watts output on SSB and 8 to 10 watts on AM. I was
wondering if there are some other changes you must make to get
25 watts AM and 40 to 45 watts SSB?... Also, I have a 2510 that
I can only get about 15 to 20 MA reading from the driver by
adjusting VR112. I can get my 50 MA by adjusting VR113 on the
final. Do you think the 2SC2166 is operating correctly?
Let me say that i am absolutely shocked that any of my readers
living in the United States would actually convert these radios.
It sounds like you have successfully gotten your extra
channels, but you're going about increasing your power in the
wrong way. You are apparently trying to get more power by
changing your bias. Not a good idea. Leave the VR112 and VR113
The best WAY to get more power out of the RADIO is to turn up
the ALC (for sideband, it's the VR104) and the AM Power (for
AM, it's the VR103). This should take care of your power
problem, but be sure not to turn up the AM Power above 20. For
more modulation, you can adjust your AMC (VR114)
MORE READER COMMENTS ON THE 2510
0 is a "fantastic radio".. BH, Cleveland, OH
"...the HR2510. I bought one and love the hell out of it. It's
the best radio that I've ever had, and I've had about every one
you could name..."...G., ,Junction City, KS
"...I found that a 'Turner plus three desk Mic with very little
gain applied makes the HR2510 sound very impressive as a base
station."..BW, Batavia, OH
MORE QUESTIONS ON HR 2510
I've been getting a whole lot of mail concerning HR2510. One
question that keeps coming up concerns converting the RIT
control into a clarifier that controls transmit frequency as
well as receive. I'm still working on that project and I hope to
whrite about it in a future article. Here are same more
questions I've been getting on the HR2510:
I run a JBl2 modulator that drives a Palomar 300A
linear (amplifier) and I'm afraid that the HR2510 would be too
much of a driver to use in my setup"...HF Groto, of a driver.
If you decide to run some "heat" with the HR2510, what
would you turn the radio down to and what "heat" would he a good
one to use..G, Junction City, KS
I have found that the radio's best audio is at 10 watts
deadkey and that's what I recommend. The peak of the 2510 is a
little high to kick some amplifiers, as I mentioned in the case
above. I would use at least something like a Texas Star 600.
Anything else may be overdriven.
Dear Mr. Steele
I hear a rumor that there are two pods inside (the
2510) for increasing power. I have only found one, the ALC, an d
have turned it up all the way and can only get 30 to 35 watts on
sideband and about 24 on AM...JA, 'Tuscaloosa, AL
I covered this ground in an earlier article, but I still
get a whole lot of mail about it. You're on the right track
Adjusting the ALC "pot" will increase power the sideband. If you
keep looking, you'll eventually locate the AMPWR "pot". Looking
down from the top of the radio, it is situated in the left-hand
corner and is clearly marked. Adjusting this "pot" will increase
power on AM. I can't explain the thirty to thirty-five watts
unless you're using a RMS meter which may not give you a truly
accurate reading of your peak power output.