[App_rpt-users] Gm300 have to set the rxondelay very high

[Corey Dean]

Many ways actually.  I have used it simplex like this and I have used it as
a remote base using link2link, and at one point in time I was even using
the steering lines and using it as a remote base. I have done this on both
VHF and UHF.

Corey  N3FE

On Wed, Jun 29, 2016 at 11:26 AM, Skyler F <electricity440 at gmail.com> wrote:

> Huh. I am running discriminator and flat TX. Did you ever test it simplex
> or was it only full duplex with two separate radios?
>
> On Wednesday, June 29, 2016, Corey Dean <n3fe at repeater.net> wrote:
>
>> I have never had this issue and I run mine on DSP.  Discriminator on rx
>> and flat tx audio.
>>
>> Corey  N3FE
>>
>> On Wed, Jun 29, 2016 at 11:20 AM, Skyler F <electricity440 at gmail.com>
>> wrote:
>>
>>> If I use software PL/CSQ decoding, I was getting reports of something
>>> coming back from the node after they unkey.
>>>
>>> Turning RXondelay up to about 6 (6 increments of 25ms) it worked great
>>> until I tuned to the bottom of the 2-meter band and I had to turn it all
>>> the way to 15 to avoid problems. It's fine unless someone quick Keyes and
>>> then I will loose the beginning of their voice.
>>>
>>> This is a simplex GM300 node, so I am guessing there is a lack of high
>>> frequency noise immediately after I unkey. What I don't get is why it is
>>> worse at the bottom end of the VHF band. I guess the VFO is sick down there
>>> and takes longer to activate?
>>>
>>> On my UHF GM300, I can get away with rxondelay set to 5 at 446.000. I
>>> haven't tested lower, but I won't be transmitting below 445.0
>>>
>>> There is a variable inductor that I found near the receiver chip which
>>> actually improved tuning it from what I was initially getting, needing to
>>> set rxondelay all the way up to 25. (It's near the squelch pot)
>>>
>>> I am going to use COR  from the radio anyway so I won't have the
>>>  problem, but I was planning on modding one for 9600 baud which could never
>>> deal with the horrible TX/RX switching time that I am getting.
>>>
>>> Any experience with this issue here? Also, It's annoying that I have to
>>> run rxondelay, I wish it could just ignore the receiver immediately after
>>> the transmitter drops, no other time. Is there any other setting?
>>>
>>> 73
>>> Skyler KD0WHB
>>>
>>>
>>>
>>> --
>>> Skyler Fennell
>>> amsatnet.info
>>> KDØWHB
>>> electricity440 at gmail.com
>>>
>>>
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>>
>>
>
> --
> Skyler Fennell
> amsatnet.info
> KDØWHB
> electricity440 at gmail.com
>
>
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