[Repeater-Builder] TKR-750 Crunchy/Grungy Weak Signal Audio

[Bob - AF6D]

My 2 meter TKR has worked fine for about a year but has always had a problem on 
our frequent weak signals. We're a mountain community and 
CERT/RACES/ARES/Skywarn users are often on HT's. There are a couple of towers 
in the neighborhood at 6,400 feet over southern California (it's kewl living at 
a repeater site) and on my own gear I don't hear anything on a weak signal 
beyond the norm. But on the TKR it just sounds dirty. Grungy. Crunchy. There 
are commercial sites within one mile with high power paging but we've detected 
no intermod. We did have a bout were grungy audio was breaking PL and hanging 
until timeout. But that went away. The Wacom 6 cavity WP-642 is tuned dead on 
and offers excellent isolation and rejection (at a cost of 2-3dB loss on TX 
sigh).

Another TKR user at a high elevation commercial site reports similar 
experiences. Yet another TKR owner reported that his is excellent and yes the 
audio is good. Just not for us on weak signals. He suggested perhaps an RFI 
issue but from where?

Our installation is modest and constrained only by my lack of time and funds. 
My daughter is sick and I live in a hospital with her, so be gentle HI HI. The 
very large guard dog watches the house.

The antenna is a Hustler G5-144 tuned with a MFJ 259, dead on and above the 
repeater through an insulated roof by about 30 feet. We have no desense. It is 
fed with LMR-400 just because I haven't put hard line on it. No preamps are 
installed. At 6,400 feet not much is needed. The receiver is .18uV. The TKR 
hears very well compared to my FT-847 with an antenna 20 feet lower.

Why the grungy audio?

Re: [Repeater-Builder] TKR-750 Crunchy/Grungy Weak Signal Audio

[Chuck Kelsey]

Probably the LMR-400 cable is the cause. Well documented and discussed here 
regularly. Are the other repeaters with the same problem also using the same 
type cable?

Chuck
WB2EDV



- Original Message - 
From: Bob - AF6D b...@af6d.com
To: Repeater-Builder@yahoogroups.com
Sent: Monday, August 09, 2010 4:46 AM
Subject: [Repeater-Builder] TKR-750 Crunchy/Grungy Weak Signal Audio


 My 2 meter TKR has worked fine for about a year but has always had a 
 problem on our frequent weak signals. We're a mountain community and 
 CERT/RACES/ARES/Skywarn users are often on HT's. There are a couple of 
 towers in the neighborhood at 6,400 feet over southern California (it's 
 kewl living at a repeater site) and on my own gear I don't hear anything 
 on a weak signal beyond the norm. But on the TKR it just sounds dirty. 
 Grungy. Crunchy. There are commercial sites within one mile with high 
 power paging but we've detected no intermod. We did have a bout were 
 grungy audio was breaking PL and hanging until timeout. But that went 
 away. The Wacom 6 cavity WP-642 is tuned dead on and offers excellent 
 isolation and rejection (at a cost of 2-3dB loss on TX sigh).

 Another TKR user at a high elevation commercial site reports similar 
 experiences. Yet another TKR owner reported that his is excellent and yes 
 the audio is good. Just not for us on weak signals. He suggested perhaps 
 an RFI issue but from where?

 Our installation is modest and constrained only by my lack of time and 
 funds. My daughter is sick and I live in a hospital with her, so be gentle 
 HI HI. The very large guard dog watches the house.

 The antenna is a Hustler G5-144 tuned with a MFJ 259, dead on and above 
 the repeater through an insulated roof by about 30 feet. We have no 
 desense. It is fed with LMR-400 just because I haven't put hard line on 
 it. No preamps are installed. At 6,400 feet not much is needed. The 
 receiver is .18uV. The TKR hears very well compared to my FT-847 with an 
 antenna 20 feet lower.

 Why the grungy audio?





 



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