[ICOM] WTB: IC-22U or IC-22S

Tue May 19 00:22:34 EDT 2009

If you really want a tight front end, try to find an IC-20

crystal controlled rig.  It is a mobile unit (12-channel).  It

is modular construction and the front end is a VERY narrow

five section (IIRC) helical resonator receiver.  You'll need a

crystal for TX and RX and that is it!  The IC-21 24-channel

fixed rig uses the same modules and has an internal 120V

power supply built in.

I expect they are VERY scarce these days.  Mine IC-20 went

to become a repeater back about 1975 or so.

They were 146-148 for USA use (limit of FM authorization

back then) but can be swung down and even peak tuned

for an even narrower front end.  I did the reverse and

broadened it to cover just below 144 for Air Force MARS

through 148.  Power dropped to about 6W from 145-148

and about 3W on MARS and lost a bit of sensitivity, but

that was acceptable to me at the time.  I drove either of

the two rigs (20 and 21) with a GLB Channelizer synthesizer.

My 21 was the second Icom that I know of in the state of

Oklahoma back in 1972.  There might have been an IC-2F

or two in the state, but I never heard of any.

73 - Mac, K2GKK/5

Oklahoma City, OK

> Date: Mon, 18 May 2009 22:07:52 -0500
> To: icom at mailman.qth.net
> From: k9jau at sbcglobal.net
> Subject: Re: [ICOM] WTB: IC-22U or IC-22S
> 
> Mike,
> I had a 22S years ago and it had a really nice, sensitive, 
> bulletproof receiver.
> Pat, K9JAUAt 08:29 PM 5/18/2009, you wrote:
> >I'm wondering how it would do in a somewhat high rf environment. The
> >antenna for the link is about 60 feet below the repeater antenna and the
> >frequencies are only 1.6 MHz apart. That's why I'm keen on the IC-22
> >line... they front ends are rumored to be bulletproof (or at least I hope
> >so)!
> >
> >73,
> >
> >Mike
> >WM4B
> >
> > > -----Original Message-----
> > > From: icom-bounces at mailman.qth.net [mailto:icom-
> > > bounces at mailman.qth.net] On Behalf Of Gary Fiber
> > > Sent: Monday, May 18, 2009 8:28 PM
> > > To: ICOM Reflector
> > > Subject: Re: [ICOM] WTB: IC-22U or IC-22S
> > >
> > > Some over the years have also used an IC-2AT which had the thumb
> > > wheel switches on it. Low power but you sure can stick an amplifier
> > > behind it. The DC-1 is the 12 volt power supply for it. !2 volts in
> > > some 9.6 volts DC out.
> > >
> > > I once ran across an article describing how to build a DTMF to BCD
> > > interface for DTMF control of the IC-2AT.
> > >
> > > Gary K8IZ
> > >
> > > At 05:03 PM 5/18/2009, you wrote:
> > > >That's what I was thinking as well. Still hoping for the 'prug and
> > > pray'
> > > >solution, but that's definitely an option.
> > > >
> > > >Haven't looked at the schematic yet... is it (hopefully) just a matter
> > > of
> > > >applying a ground?
> > > >
> > > >Mike
> > > >WM4B
> > > >
> > > > > -----Original Message-----
> > > > > From: icom-bounces at mailman.qth.net [mailto:icom-
> > > > > bounces at mailman.qth.net] On Behalf Of Jim Hargrave
> > > > > Sent: Monday, May 18, 2009 6:17 PM
> > > > > To: ICOM Reflector
> > > > > Subject: Re: [ICOM] WTB: IC-22U or IC-22S
> > > > >
> > > > > Mike,
> > > > >
> > > > > That is not a big problem, since you are planning on using them for
> > > a
> > > > > fixed
> > > > > frequency application.
> > > > >
> > > > > You can program one channel for the receive frequency and another
> > > for
> > > > > the
> > > > > transmit frequency and switch channels from Rec/Transmit. That will
> > > > > give you
> > > > > the 600hz offset.
> > > > >
> > > > > * 73's Jim W5IFP *
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > >-----Original Message-----
> > > > > >From: icom-bounces at mailman.qth.net
> > > > > >[mailto:icom-bounces at mailman.qth.net]On Behalf Of Mike Besemer
> > > > > (WM4B)
> > > > > >Sent: Monday, May 18, 2009 10:01 PM
> > > > > >To: 'ICOM Reflector'
> > > > > >Subject: Re: [ICOM] WTB: IC-22U or IC-22S
> > > > > >
> > > > > >
> > > > > >Jim,
> > > > > >
> > > > > >I did see the mods for the lower frequencies, but unfortunately
> > > I
> > > > > need a
> > > > > >duplex application since it'll be used as a remote base.
> > > > > >
> > > > > >I've thought of several ways to get around the 400 KHz problem,
> > > > > >but all are
> > > > > >more work then I want to do if I can avoid it! I'm hoping to
> > > > > >find a 'U' or
> > > > > >even a cheap 'A' that I can crystal for our application. If
> > > not,
> > > > > I'll
> > > > > >probably find and 'S' and do some mods to make it do what we
> > > need.
> > > > > >
> > > > > >Thanks for the help.
> > > > > >
> > > > > >73,
> > > > > >
> > > > > >Mike
> > > > > >WM4B
> > > > > >
> > > > > >> -----Original Message-----
> > > > > >> From: icom-bounces at mailman.qth.net [mailto:icom-
> > > > > >> bounces at mailman.qth.net] On Behalf Of Jim Hargrave
> > > > > >> Sent: Monday, May 18, 2009 5:46 PM
> > > > > >> To: ICOM Reflector
> > > > > >> Subject: Re: [ICOM] WTB: IC-22U or IC-22S
> > > > > >>
> > > > > >> Mike,
> > > > > >>
> > > > > >> You can modify the IC-22s for the lower 2m frequencies. I
> > > > > >have modified
> > > > > >> several and at one time had 4 of them on my Packet
> > > > > >BBS/Cluster. It is a
> > > > > >> very
> > > > > >> reliable rig after you fix the synthesizer. All the Icom
> > > > > >radios of that
> > > > > >> vintage used steel feed-thru pins in the synthesizer boards.
> > > > > After a
> > > > > >> time
> > > > > >> the solder connection would go cold due to dissimilar metals.
> > > The
> > > > > 22s
> > > > > >> has 13
> > > > > >> such animals. I removed them and replaced them with a short
> > > piece
> > > > > of
> > > > > >> copper
> > > > > >> wire. That fixed them.
> > > > > >>
> > > > > >> To put a 22S on the lower frequencies you replace the
> > > synthesizer
> > > > > >> Reference
> > > > > >> crystal and add a divide by 2 IC. I used 1/2 of a CD4013.
> > > That
> > > > > will
> > > > > >> make it
> > > > > >> tune to the lower part of the band in 5 khz increments. 10.24
> > > mhz
> > > > > CB
> > > > > >> crystals work fine. The drawback to this mod, is the radio is
> > > > > >only good
> > > > > >> for
> > > > > >> simplex as the shift becomes 400 khz instead of 600. Most of
> > > our
> > > > > >> application
> > > > > >> was as packet digis, so it was not a problem. Some were also
> > > used
> > > > > as
> > > > > >> repeater receivers.
> > > > > >>
> > > > > >> If you can find the 22U, its better, but a lot more 22s's
> > > were
> > > > > made
> > > > > >> than
> > > > > >> 22u's. Sorry, but I gave away 3 of the modified 22s a couple
> > > of
> > > > > years
> > > > > >> ago.
> > > > > >> Except for the DX Cluster, packet is a fading mode in this
> > > area.
> > > > > >>
> > > > > >> * 73's Jim W5IFP *
> > > > > >>
> > > > > >>
> > > > > >> >-----Original Message-----
> > > > > >> >From: icom-bounces at mailman.qth.net
> > > > > >> >[mailto:icom-bounces at mailman.qth.net]On Behalf Of
> > > > > >mwbesemer at cox.net
> > > > > >> >Sent: Monday, May 18, 2009 7:09 PM
> > > > > >> >To: ICOM Reflector
> > > > > >> >Subject: Re: [ICOM] WTB: IC-22U or IC-22S
> > > > > >> >
> > > > > >> >
> > > > > >> >All,
> > > > > >> >
> > > > > >> >I just realized that the IC-22S does not cover below 146
> > > MHz
> > > > > and I
> > > > > >> need
> > > > > >> >it down on 145.11. Because of this, I can only use an
> > > IC-
> > > > > 22U.
> > > > > >> >
> > > > > >> >Sorry about that es 73,
> > > > > >> >
> > > > > >> >Mike
> > > > > >> >WM4B
> > > > > >> >
> > > > > >> >
> > > > > >> >On Mon, May 18, 2009 at 3:07 PM , mwbesemer at cox.net
> > > wrote:
> > > > > >> >
> > > > > >> >> I'm looking for an Icom IC-22U or IC-22S for use at a
> > > > > >> >repeater site as
> > > > > >> >> a remote base. Physical condition is not particularly
> > > > > important.
> > > > > >> I
> > > > > >> >> would prefer a working unit, but may consider one in
> > > > > repairable
> > > > > >> >> condition, depending on the fault.
> > > > > >> >>
> > > > > >> >> 73,
> > > > > >> >>
> > > > > >> >> Mike
> > > > > >> >> WM4B
> > > > > >> >> ----
> > > > > >> >> Your Moderator: Dick Flanagan K7VC: icom-
> > > > > owner at mailman.qth.net
> > > > > >> >> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > > > >> >> Icom FAQ: http://www.qsl.net/icom/
> > > > > >> >> To support QSL/QTH.net: http://www.qsl.net/donate.html
> > > > > >> >----
> > > > > >> >Your Moderator: Dick Flanagan K7VC: icom-
> > > > > owner at mailman.qth.net
> > > > > >> >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > > > >> >Icom FAQ: http://www.qsl.net/icom/
> > > > > >> >To support QSL/QTH.net: http://www.qsl.net/donate.html
> > > > > >>
> > > > > >> ----
> > > > > >> Your Moderator: Dick Flanagan K7VC: icom-
> > > owner at mailman.qth.net
> > > > > >> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > > > >> Icom FAQ: http://www.qsl.net/icom/
> > > > > >> To support QSL/QTH.net: http://www.qsl.net/donate.html
> > > > > >
> > > > > >
> > > > > >----
> > > > > >Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > > > > >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > > > >Icom FAQ: http://www.qsl.net/icom/
> > > > > >To support QSL/QTH.net: http://www.qsl.net/donate.html
> > > > >
> > > > > ----
> > > > > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > > > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > > > Icom FAQ: http://www.qsl.net/icom/
> > > > > To support QSL/QTH.net: http://www.qsl.net/donate.html
> > > >
> > > >
> > > >----
> > > >Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > > >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > >Icom FAQ: http://www.qsl.net/icom/
> > > >To support QSL/QTH.net: http://www.qsl.net/donate.html
> > >
> > > Gary Fiber K8IZ
> > > GROL PG-19-6691
> > > Washington State Resident
> > >
> > > ----
> > > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > Icom FAQ: http://www.qsl.net/icom/
> > > To support QSL/QTH.net: http://www.qsl.net/donate.html
> >
> >
> >----
> >Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> >Icom FAQ: http://www.qsl.net/icom/
> >To support QSL/QTH.net: http://www.qsl.net/donate.html
> 
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html