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Extending the frequency range of the Alinco ALR22T
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ALR22T
From : WA2ISE @ KD6TH.NJ.USA
To : MODS @ ALLUS
Date : 900609/0441
MsgID : BF 28114@KD6TH, 673@KJ6YT $966_WA2ISE
Subject : alr22t mod file
Via : AA6QD!K6TZ!N6AZD!AA4RE!W8GEC!KA6FUB!N6ECP!AL7IN!KA0DFN!WB7VMS!N7DXT!N7JQK!W0RLI!N7KMJ!KB7!AH6AA!KD7HP!KE7TB!VE6JR!VE6YYC!VE3JF!VE3IWJ!NA2B!WA2SPL!WA2UMX!WA2RKN!KB4VSP!WB2QJA!KD6TH
Date: 09 Jun 90 04:41:55 UTC (Sat)
From: [email protected] (Bob)
Message-ID: <[email protected]>
Reply-To: wa2ise@wa2ise
To: mods@allbbs
Subject: alr22t mod file
Do not modify your radio unless you:
1) plan to drive a transverter
2) want to test a receiver (drive a dummy load and listen for leakage)
3) have the MARS or CAP permits.
You cannot use this radio on public service bands because it is NOT
type accepted by the FCC.
>Don't transmit out of band!<
I haven't tried or verified this mod, proceed at your own risk.
WA2ISE
CONTINUED IN FILE ALR22T.2
ALR22T.2
EXTENDED FREQUENCY RX AND TX OF THE ALR22T & ALR22HT
ALINCO 2 METER RADIOS.
BEWARE OF ANY STATIC WHEN WORKING WITH THIS RADIO !!!
1 Remove the top and bottom covers of the radio.
2 Remove the 4 screws that hold the front panel ssembly to the main
chassis.
3 Pull front panel away from the main chassis very gently.
4 Locate the Volume\Squelch pot on the left side of the radio.
5 Locate the VFO control on the left side of the radio.
6 Between the two above units is an IC that runs vertically between
the two units. (ONLY THE 12 PINS OF THE IC ARE SEEN FROM THE BACK)
7 After locating the IC locate 3 sets of unsoldered jumper pads between
the IC pins.
8 Make a solder bridge between the top 2 pads,then the middle 2 pads,then
between the bottom 2 ONLY of the bottom set of 3 pads.
CONTINUED IN FILE ALR22T.1
ALR22T.1
REAR VIEW OF FRONT PANEL
/ ------\ 12 PIN O * O /---------\
/ VOLUME \ IC -> !<-SOLDER BRIDGE / \
/ CONTROL \ O * O / \
/ \ / VFO \
\ / O * O \ CONTROL /
\ / !<-SOLDER BRIDGE \ /
\-----/ O * O \--------/
O * O
* DO NOT SOLDER THE TOP PAD
O !< O OF THESE 3 PADS
* \SOLDER BRIDGE HERE
9 RE-ASSEMBLE RADIO .
10 RESET MICROPROCESSOR.
11 This mod will extend the RX range as well as the TX range of the above
unit.The display will have a range from 29mhz to 299 mhz but this is
just an erroneos display as the PLL on a typical radio will rx between
130 mhz and 180mhz with a TX range that may be a little beyond these
these frequencies.
GOOD LUCK AND HAPPY MODING
73 CARL
Packet: VE3ZCO@VE3GYQ
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Note: I haven't tried or verified this, proceed at your own risk. WA2ISE
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