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- Date: Sat, 23 Apr 94 04:30:06 PDT
- From: Info-Hams Mailing List and Newsgroup <info-hams@ucsd.edu>
- Errors-To: Info-Hams-Errors@UCSD.Edu
- Reply-To: Info-Hams@UCSD.Edu
- Precedence: Bulk
- Subject: Info-Hams Digest V94 #447
- To: Info-Hams
-
-
- Info-Hams Digest Sat, 23 Apr 94 Volume 94 : Issue 447
-
- Today's Topics:
- amcomm s225 and yeasu ft23
- ICOM 720 SERVICE MANUAL NEEDED
- Illinois Scan Ban Proposed
- Mac HyperTerm <> Ham TX/RX
- Missing: Good HF Propagation
-
- Send Replies or notes for publication to: <Info-Hams@UCSD.Edu>
- Send subscription requests to: <Info-Hams-REQUEST@UCSD.Edu>
- Problems you can't solve otherwise to brian@ucsd.edu.
-
- Archives of past issues of the Info-Hams Digest are available
- (by FTP only) from UCSD.Edu in directory "mailarchives/info-hams".
-
- We trust that readers are intelligent enough to realize that all text
- herein consists of personal comments and does not represent the official
- policies or positions of any party. Your mileage may vary. So there.
- ----------------------------------------------------------------------
-
- Date: Tue, 19 Apr 1994 11:02:44 -0400
- From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!math.ohio-state.edu!news.acns.nwu.edu!ftpbox!mothost!lmpsbbs!NewsWatcher!user@network.ucsd.edu
- Subject: amcomm s225 and yeasu ft23
- To: info-hams@ucsd.edu
-
- In article <kthompso.57.000D9A2B@WichitaKS.NCR.COM>,
- kthompso@WichitaKS.NCR.COM (Ken Thompson) wrote:
-
- > First a question about the amcomm s225.
- > This is a mobile unit from the mid-'70s.
- > Recv seems ok but the TX is off by +2.8kHz.
- > I have the schematics but it is an unusual design.
- > Anyone have any experience with this model or
- > willing to make some suggestions if I send a copy of the schematic?
-
- And I thought I had the only remaining S2-25! The transmit frequency can
- be adjusted by removing the top and bottom covers and adjusting the large
- piston trimmer capacitor mounted vertically on the bottom PC board. Two
- notes of caution are in order: First, you MUST use an insulated or non-
- metallic tuning tool for this adjustment. Second, this adjustment is also
- temperature sensitive, so do not leave the covers off very long before you
- make the required adjustment.
-
- As an alternative, since you know you are 2.8 kHz high right now, remove
- the covers and power up the radio for at least one hour on the bench. Pick
- any channel and measure the transmit frequency as it sits, running into a
- dummy load of course. Then adjust the trimmer to lower the frequency by
- 2.8 kHz and button everything back up. I ended up drilling a small hole in
- the cover so I could tweak the frequency without removing the housing.
-
- This rig uses a novel synthesizer operating on the receiver injection
- frequency and a heterodyne exciter to put the transmitter on the proper
- operating frequency. There are no easy mods for out-of-band, but it does
- have entire 144-148 band coverage in 5 kHz steps, which was FAR ahead of
- its time. The receiver is quite good for local packet, and it will receive
- 9600 baud without modification since it uses fairly wide filters. The
- CA3089
- limiter/detector IC (now obsolete) should NOT be replaced with the CA3189
- substitute if you are running 9600. I took the top of the volume control
- out
- on the 6-pin DTMF encoder socket to provide a separate packet TNC
- connector.
-
- >
- > Second I would like to investigate a noise problem on transmitted audio from
- > the ft-23 while using an external mike. Does anyone have a service manual
- > and/or schematic of which they would be willing to send copies?
- >
- > Ken.
-
- If I remember correctly, this unit does NOT mute its internal microphone
- when the external mic is plugged in. The only cure in this situation is to
- cover the internal microphone or disconnect it completely from the circuit.
- If you put the HT in your pocket, the noise of the fabric rubbing across
- the grille will drive listeners batty; if you use a leather belt case in
- a noisy area, the radio picks up the local noise on the internal (open)
- microphone and seriously degrades your audio. Good Luck
-
- --
- Karl Beckman, P.E. < STUPIDITY is an elemental force for which >
- Motorola Comm - Fixed Data < no earthquake is a match. -- Karl Kraus >
-
- The statements and opinions expressed here are not those of Motorola Inc.
- Motorola paid a marketing firm a huge sum of money to get their opinions;
- they have made it clear that they do not wish to share those of employees.
-
- Amateur radio WA8NVW @ K8MR.NEOH.USA.NA NavyMARS VBH @ NOGBN.NOASI
-
- ------------------------------
-
- Date: 21 Apr 1994 15:34:33 GMT
- From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!utnut!torn!news.unb.ca!nbt.nbnet.nb.ca!ve1fc.nbnet.nb.ca!ve1fc@network.ucsd.edu
- Subject: ICOM 720 SERVICE MANUAL NEEDED
- To: info-hams@ucsd.edu
-
- Need an ICOM 720 A service manual in the worst way ...
- I have a radio, which is in very bad condition and need the service manual
- to get it up and running.
- Appreciate any replys.
- by the way ICOM America does not have one, so they say....
-
- RGDS & TNX
- Graham
- ve1fc@nbnet.nb.ca
-
- ------------------------------
-
- Date: Tue, 19 Apr 94 18:43:37 -0600
- From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!math.ohio-state.edu!news.acns.nwu.edu!news.eecs.nwu.edu!fidogate.nuars.nwu.edu!nwugate.fidonet.org!f747.n115.z1.fidonet.org!Jerry.Smith@network.
- Subject: Illinois Scan Ban Proposed
- To: info-hams@ucsd.edu
-
- Here is a couple of key addresses to voice your opposition to Illinois
- House Bill 4180, the proposed banning of DC powered scanning equipment.
- Tom Cross is the Representative proposing this bill.
-
-
- Illinois Rep. Tom Cross
- 541 Countryside Shopping Center
- Yorkville, IL 60560
-
- 2138 -O Stratton Building
- Springfield, IL 62706
-
- -------------------------------
- Illinois Govonor Jim Edgar
- State Capitol
- Springfield, IL 62706
- -------------------------------
-
- Representatives for your district may be found by calling your local public
- library.
-
- * * NON-RESIDENTS OF ILLINOIS...Your input is just as important. If this
- law is passed, this may give YOUR representatives to propose laws similiar
- to this in your state. Please send your letters to the above two
- individuals.
-
- Jerry
-
-
- ------------------------------
-
- Date: Thu, 21 Apr 1994 15:12:03 GMT
- From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!pipex!demon!news@network.ucsd.edu
- Subject: Mac HyperTerm <> Ham TX/RX
- To: info-hams@ucsd.edu
-
-
- Hello All,
-
- I have an interest in amateur (Ham) radio. As such I have been using HyperTerm
- to create a HyperCard stack which will allow me to control a Shortwave
- transmitter via it's RS232 interface.
-
- In order to turn off several of the transmitter's functions I need to be able
- to send the "NULL", character ($00) from HyperTerm to the transmitter. I cannot
- seem to be able to get HyperTerm to do this.
-
-
- Anyone any ideas ?
-
- Regards, Sean.
-
- ------------------------------
-
- Date: Thu, 21 Apr 1994 14:42:07 GMT
- From: ihnp4.ucsd.edu!usc!cs.utexas.edu!utnut!utcsri!newsflash.concordia.ca!canopus.cc.umanitoba.ca!tribune.usask.ca!kakwa.ucs.ualberta.ca!gov.nt.ca!ve8ev@network.ucsd.edu
- Subject: Missing: Good HF Propagation
- To: info-hams@ucsd.edu
-
- MISSING PROPOGATION FOUND!
-
- HF propogation reappeared over the last two days.
- Was last seen moving over the North Pole and down the west coast
- and into the South Pacific. Grab it while it lasts!
-
- de VE8EV
-
- ------------------------------
-
- End of Info-Hams Digest V94 #447
- ******************************
-