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MKARS80
Transceiver kit
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The MAKRS80 is a QRP transceiver designed for use
for use on the 80M band, the circuit was developed from the
BITX20
designed by Ashhar Farhan. Although simple in design perceived
performance is as good as a commercial transceiver.
Main changes from Ashhar's original design are
the inclusion of a frequency counter and a Huff and Puff
frequency stabiliser; this circuit will help keep the VFO tuned
to the same frequency for long periods without any "drift".
As seen in the photo to the left, all components
are mounted on to a single high quality PCB making construction
relatively straight forward. The only "wiring" needed
is short pieces of wire to connect the potentiometers to the PCB.
To assist with construction there is a
comprehensive manual that can be downloaded from this page, also
available for download are a drilling template and front panel
overlay.
Why not joint the MKARS80 support
group?
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Features
Full 80M LSB
coverage (3.5 - 3.8MHz)
~ 5 Watts output
power
Single conversion
superhet with 4 pole crystal filter
Frequency display
with "Huff and Puff" circuit for stabilisation
Modulation
monitor - helps stop over modulation
Volt meter -
useful for battery operation
Reverse polarity protection (fuse protected)
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Photo showing a typical finished MKARS80, note that the knobs
supplied as an option are all black without the aluminium
inserts.
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Downloads
MKARS80
construction manual version 1.3
Latest version for
currently supplied kits.
MKARS80
construction manual version 1.3 in Spanish
Thanks
to Jon EA2SN for the translation
Drilling
template
Printout with Adobe
Acrobat reader, set paper size set to A4 and page scaling set
to "none". Stick onto case as described in construction
manual and use as a drilling template for the holes and cutout.
Panel
overlay
Print and laminate as a front panel, alternatively
use the mirrored overlay below.
Mirrored
overlay
Print on acetate and use as a front panel, the
print will then be on the reverse side so it doesn't become
scratched
Hires
Schematic (JPEG)
Bold
Text Schematic (PDF)
Two different formats of schematic
which will be easier to read than that in the manual
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MKARS80 PIC
firmware
Download and modify for your own use, perhaps the
easiest modification is to change the startup screen to include
your own callsign. This will require the installation of MPLAB,
download from the Microchip
website free of charge.
VFO
stability modification
Makes a significant improvement to
the VFO stability on early transceivers, this was incorporated
into the kit from Dec 2008
Old data
MKARS80
construction manual V1.0
Only for use with kit version
V1.0, this has minor component differences so don't use with
other versions
MKARS80
construction manual V1.2
For kit version V1.1 and V1.2
NOTE: Kit version can be found on component
listing in all component bags.
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Kit Contents
The kit contains all PCB mounted components
including display, connectors and a ready programmed micro. The
builder will need to provide a loudspeaker (3-32 Ohms) and an
electret microphone; a dynamic type can be used if the bias
resistor (R17) is removed or a series capacitor is installed
between microphone and transceiver.
Knobs are not supplied as standard but may be
ordered as an option.
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How to order
Payment can be accepted by PayPal, direct bank
transfer, Western Union or by a Sterling cheque from a UK bank.
For details on payment by Western Union or direct transfer please
contact us for our banking details.
Probably the easiest way to pay is by PayPal,
below are a series of "buttons" - select the
appropriate one(s) and when finished click "View Cart",
once payment has been made you should get an e-mail from PayPal
confirming payment - we will send you an e-mail (to your Paypal
e-mail address) normally within 12 hours advising on delivery
etc.
UK orders can be made by cheque or postal order,
HERE is an order form with
up-to-date pricing for UK delivery.
Note that PayPal prices include postage, not included are any
import taxes which may be charged by your customs (non EC
countries); YOU are responsible for these. We can not enter
"sample" or "gift" in the customs form so
please don't ask
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Posted to the UK
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MKARS80 kit supplied with an un-drilled aluminium
case
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£60.00
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Posted to European continent (EC, Russia, Norway etc.
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£62.00
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International post (USA, Canada, Indonesia etc.)
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£64.00
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MKARS80 kit supplied without any case
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Posted to the UK
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£53.00
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Posted to European continent (EC, Russia, Norway etc.
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£54.00
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International post (USA, Canada, Indonesia etc.)
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£55.00
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Options
Note options can only be
purchased with a kit
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Knobs kit - large, medium and small knobs with 4 rubber feet
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£2.00
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Connector kit - Includes BNC plug, 3.5mm stereo jack,
3.5mm mono jack and 2.1mm DC plug
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£2.50
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View or finish your order
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