3658Re: [tracker2] New Tracker2 not decoding packets very well
- May 4, 2008How do you have the htx202 connected to the tracker2? What resistor and
capacitor values are you using in the connection for ptt? I've got a
couple OTs using the 202's and packet in general with no troubles.
Brent Gay wrote:
> Here is my latest testing:
> Yaesu to PK-232 - Decodes
> HTX-202 to PK-232 - Decodes
> Yaesu to Tracker2 - Decodes
> HTX-202 to Tracker2 - Does not decode even a signal coming from the
> same room.
> I have checked wiring, reset/reflashed the tracker, made sure all
> settings were correct. Is there anyone who is using a HTX-202 with a
> Tracker2 that can tell me how it is working for you and any advice?
> Thanks Keith for the investigation you did. I am hoping there is some
> way to get this working without having to rewire the inside of the radio.
> On Sun, May 4, 2008 at 8:32 AM, Keith VE7GDH <ve7gdh@...
> <mailto:ve7gdh@...>> wrote:
> Brent KF4JZY wrote...
> > Now the question is why in the world am I having such a hard
> time with
> > the HTX-202??? I really would like to use that radio because it is a
> > spare and I do not want to buy another. Do I need to have a resistor
> > and capacitor somewhere in the cable? I saw that in some diagrams.
> I know there are people using the HTX-202 but I did a search...
> http://www.tigertronics.com/bay_wire.htm#RADIO SHACK
> RADIO SHACK - (HTX-202, HTX-404) Wired the same as ICOM.
> This radio does not receive as well as some others on packet. The
> problem is that the radio's audio frequency response rolls off too
> soon and distorts the high tone...
> Also http://www.qrz.com/download/mods-e-h/htx202pk.txt
> *** The file name is htx202pk.txt but the subject says HTX-252
> Subject: Subj: HTX-252 Packet
> This radio wasn't particularly suited to packet use as purchased.
> Transmit was easily decoded by other rigs, but receive audio was,
> shall we say, horrible. Looking at the audio signal it appeared
> that the 1200Hz tone had about 6-12dB more gain than the 2200Hz
> tone when working 1200 AFSK.
> To solve this, route the rx signal directly from the FM detector
> directly to the 1/8" speaker jack. The audio signal has a DC
> componant that is blocked by a 470uF/16V electrolytic (radial
> leaded tubular located near the side of the chassis near the
> speaker jack).
> Remove the 470uF cap and use one pad to route the rx signal
> from the FM detector (TK10487 pin 11) through a small cap
> (there is a DC bias on pin 11) to the pad connected to the speaker
> jack. I used a .015 from the junk box as it was small enough to
> fit between the PCB and the cover.
> The audio can also be reconnected using a axial leaded cap
> (+ to PCB) in the remaining pad (signal from the audio amplifier)
> to provide audio to the speaker (probably the brown wire, other
> side is connected to ground).
> Speaker now works, volume/squelch do con control the signal
> to the speaker jack, it is line-level at about 800mV for a packet
> signal. Note that the jack is unsquelch-ed, so newer TNC's only...
> regards - Willy KC0JFQ
> Given the above information, I think you would be better off with
> the EQ
> jumper on. Try it with un-squelched and with SWDCD ON. Good luck with
> the HTX-202.
> 73 es cul - Keith VE7GDH
> "I may be lost, but I know exactly where I am!"
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