Re: [DSTAR_DIGITAL] Radios needed
It may cost more than it is worth, but I suppose you could buy narrow crystal filters from ComSpec or M for the rec. The TX would be pretty simple - just reduce IDC. On Thu, May 27, 2010 at 5:17 PM, Gary wrote: > > > The Staten Island Digital Group is looking to purchase a few > spare/replacement radios for its WG2MSK D-Star (G4ULF) repeater system. > > One of the radios in use seems to be a bit flakey, and the SM-50’s I > purchased at Dayton turn out to NOT be narrow band. > > -- NU5D - Nickel Under Five Dollars
RE: [DSTAR_DIGITAL] Re: Radios needed
John, Thanks for the suggestion. However this is NYC, every allocation is in use, and we will be extremely close distance wise to the lower adjacent, even at 12.5. I can get into more details off list if you wish. Gary KB2BSL From: dstar_digital@yahoogroups.com [mailto:dstar_digi...@yahoogroups.com] On Behalf Of john_ke5c Sent: Thursday, May 27, 2010 6:58 PM To: dstar_digital@yahoogroups.com Subject: [DSTAR_DIGITAL] Re: Radios needed > The Staten Island Digital Group is looking to purchase a few > spare/replacement radios for its WG2MSK D-Star (G4ULF) repeater system. > > One of the radios in use seems to be a bit flakey, and the SM-50's I > purchased at Dayton turn out to NOT be narrow band. I've been thinking about this for an upcoming project. Unless you have a nearby adjacent channel repeater, in this application - one fixed channel operation, why do the radios need to be narrow band? You can throttle your transmitted bandwidth by adjusting your modulator drive, and your S/N may be very minimally degraded by adjacent spectral noise, but that may well be imperceptible. The only issue might be synthesizer steps falling off your frequency, but that can be remedied by a VCO adjustment. Thoughts? 73--John
[DSTAR_DIGITAL] Re: Radios needed
> The Staten Island Digital Group is looking to purchase a few > spare/replacement radios for its WG2MSK D-Star (G4ULF) repeater system. > > One of the radios in use seems to be a bit flakey, and the SM-50's I > purchased at Dayton turn out to NOT be narrow band. I've been thinking about this for an upcoming project. Unless you have a nearby adjacent channel repeater, in this application - one fixed channel operation, why do the radios need to be narrow band? You can throttle your transmitted bandwidth by adjusting your modulator drive, and your S/N may be very minimally degraded by adjacent spectral noise, but that may well be imperceptible. The only issue might be synthesizer steps falling off your frequency, but that can be remedied by a VCO adjustment. Thoughts? 73--John
[DSTAR_DIGITAL] Radios needed
The Staten Island Digital Group is looking to purchase a few spare/replacement radios for its WG2MSK D-Star (G4ULF) repeater system. One of the radios in use seems to be a bit flakey, and the SM-50's I purchased at Dayton turn out to NOT be narrow band. For some reason GM300's with the following model numbers seem hard to find: M44GMC00D3AA M44GMR00D3AA M44GMC09C3AA Or any combination containing *44GM*0**3** Was going to purchase some new Icom commercials, but then discovered they are PM not FM. Also open to other suggestions. Please contact off list. Thank You Gary KB2BSL
[DSTAR_DIGITAL] Re: Quick Check of Repeater Frequency
My ears are burning... Tom, You caught us between site visits with our pants down! We changed frequencies on the Pocopson W3EOC B 440 repeater from 445.075 to 445.0675 for coordination purposes (we added a new repeater KB3SLR B at Bucktown and split the 445.075 analog channel). Till today, we had not yet been to the site to actually make the frequency change. The Repeater directory and website references had been changed in advance. Things finally got in sync today. Sorry for the confusion. It would sure be great if you would join us at Chester County ARES/RACES/MARS. We are a very active group and into some interesting projects on almost all fronts, including high-speed data across the county (and not just D-Star, but cheaper and faster HSMM and MESH). The usual APRS, VHF/UHF and HF phone, WL2K, and now NBEMS are all well practiced, too. See our site www.w3eoc.org and look for the membership application link. Glad to have you! Nate, Thanks for all the kind words... 73, Lor W3QA --- In dstar_digital@yahoogroups.com, Nate Duehr wrote: > > I think you'll find Lor to be very helpful. He's mentored a lot of folks > over the years in IRLP and other linking, so I have to assume he's probably > quite knowledgeable about the local D-STAR stack as well. > > Have fun! > > Nate > > On May 27, 2010, at 12:00 AM, kb...@... wrote: > > > > > Nate, > > Thanks, > > Tom > > > > > > > > -Original Message- > > From: Nate Duehr > > To: dstar_digital@yahoogroups.com > > Sent: Thu, May 27, 2010 12:41 am > > Subject: Re: [DSTAR_DIGITAL] Quick Check of Repeater Frequency > > > > > > On May 26, 2010, at 11:16 AM, > > kb...@... > > wrote: > > > > > W3EOC > > > > W3EOC > > CHESTER COUNTY ARES > > 2 Woodland Circle > > Downingtown, PA 19335 > > USA > > > > > > > > > > Nate Duehr > n...@... > > facebook.com/denverpilot > twitter.com/denverpilot >
[DSTAR_DIGITAL] Re: ID800 High power DV transmit issue- More info
I've had this same issue installed my first vehicle radio TR-7850 (50W FM). At PTT I measured at the rig 10.2VDC (engine on) and my memories got wiped out as well ass got feedback my TX was dropping out. It was due to the 12AWG speaker wires I used and the length of the run (about 13' with all the twists and thru firewall under the mat, etc). I installed 8AWG construction cable and all this went away. At PTT I now measured 13.7VDC (engine on). Now I run multiple rigs IC-7000 and IC-2800 and only install 8AWG wires that (I buy from Tower Electronics - very flexible). At DC voltage - wire acts like a resistor. [The equalizer resistors on power supply pass transistors can be 12" 30AWG that will drop 1V.] Truck design industry - recommends for 12-28VDC current/fusing per wire size per 20ft length. Wire Gauge; Protective Device Size; Maximum Current (Amps) 18 AWG; 10 AMP Fuse/Circuit Breaker; 8 A 16 AWG; 15 AMP Fuse/Circuit Breaker; 12 A 14 AWG; 20 AMP Fuse/Circuit Breaker; 16 A 12 AWG; 25 AMP Fuse/Circuit Breaker; 20 A 10 AWG; 30 AMP Fuse/Circuit Breaker; 24 A 8 AWG; 12 Gauge Fusible Link; 80 A 6 AWG; 10 Gauge Fusible Link; 108 A 4 AWG; two12 Gauge Fusible Link; 160 A Often if more current is needed we will double up the wires/cables into "O"ot gauges with 200/250A fuse links (especially to Starters) until we see only uVolts of drop. FYI, your battery should see no more than a maximum 14.2VDC with engine on (and minimum of 13.8VDC), more voltage and you will cook your battery and likely have a regulator problem. --- In dstar_digital@yahoogroups.com, "w0rmt" wrote: > > So I took the radio our of the truck and plugged in into the control head and > power supply for my other 800 in the house and it worked fine. Therefore the > radio itself must be fine, meaning that the SWR of the system in the truck is > high and/or the power supply in the truck is problematic. > > I did notice that when the truck is running, the power to the rig is a bit > high (14.5V). When keyed on high power and when the truck is off, voltage > drops from 12V to 11.6V. I think I might need to invest in a voltage > regulator. Any suggestions? > > 73 de Bud > W0RMT >
