WRNA710AZ
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Posts posted by WRNA710AZ
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11 minutes ago, Sshannon said:
Don’t confuse bandwidth with deviation (if I understand you correctly).
The two things are addressed separately in regulations:
§ 95.1773 GMRS authorized bandwidths.
Each GMRS transmitter type must be designed such that the occupied bandwidth does not exceed the authorized bandwidth for the channels used. Operation of GMRS stations must also be in compliance with these requirements.
(a) Main channels. The authorized bandwidth is 20 kHz for GMRS transmitters operating on any of the 462 MHz main channels (see § 95.1763(a)) or any of the 467 MHz main channels (see § 95.1763(c)).
(b) Interstitial channels. The authorized bandwidth is 20 kHz for GMRS transmitters operating on any of the 462 MHz interstitial channels (see § 95.1763(b)) and is 12.5 kHz for GMRS transmitters operating on any of the 467 MHz interstitial channels (see § 95.1763(d)).
(c) Digital data transmissions. Digital data transmissions are limited to the 462 MHz main channels and interstitial channels in the 462 MHz and 467 MHz bands.
§ 95.1775 GMRS modulation requirements.
Each GMRS transmitter type must be designed to satisfy the modulation requirements in this section. Operation of GMRS stations must also be in compliance with these requirements.
(a) Main channels. The peak frequency deviation for emissions to be transmitted on the main channels must not exceed ± 5 kHz.
(b) 462 MHz interstitial channels. The peak frequency deviation for emissions to be transmitted on the 462 MHz interstitial channels must not exceed ± 5 kHz.
(c) 467 MHz interstitial channels. The peak frequency deviation for emissions to be transmitted on the 467 MHz interstitial channels must not exceed ± 2.5 kHz, and the highest audio frequency contributing substantially to modulation must not exceed 3.125 kHz.
(d) Overmodulation. Each GMRS transmitter type, except for a mobile station transmitter type with a transmitter power output of 2.5 W or less, must automatically prevent a higher than normal audio level from causing overmodulation.
(e) Audio filter. Each GMRS transmitter type must include audio frequency low pass filtering, unless it complies with the applicable paragraphs of § 95.1779 (without filtering).
(1) The filter must be between the modulation limiter and the modulated stage of the transmitter.
(2) At any frequency (f in kHz) between 3 and 20 kHz, the filter must have an attenuation of at least 60 log (f/3) dB more than the attenuation at 1 kHz. Above 20 kHz, it must have an attenuation of at least 50 dB more than the attenuation at 1 kHz.
If anyone is mixing terms, it's Wouxun. My question is correct as it stands.
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In a related question, does anyone know whether or not the KG-1000G PLUS has the same issue?
Also, the specifications in the manual for the KG-1000G says that Wideband deviation is +/- 5KHZ and Narrowband is +/- 2.5KHz. In the past commercial and amateur radio WB was always +/- 12.5 KHz and NB was +/- 5KHz. The +/- 2.5 KHz is used on the FRZ interstitial channels. Our GMRS club repeaters are commercial radios and are limited to +/- 5 KHz, which is considered NB. If a user's KG-1000 G radio is set to NB, the audio would be low on a NB repeater like ours.
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Is anyone else having and issue programming the BTech GMRS Pro using the iOS app on an iPad? All software is the latest version. I can create a new group and save it with a channel but when I hit the icon to sync it to the radio the app crashes or, closes, and opens the Home Screen on the iPad. Several other features when clicked to turn on do the same thing.
TYIA
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15 hours ago, tweiss3 said:
or
Either of those what you are looking for?
Thanks but, you still need the MBA - 2 or MBA-5 to work with those mounts.
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I saw that some people are 3-D printing mounts for the IC-2730A control head. Has anyone seen them for sale? Icom is out of their minds with their mounts and pricing!
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If you can find an old (1970s) mobile radio telephone transceiver, they had very nice compact duplexers in them. You'd need a service monitor with spectrum analyzer or a signal generator and spectrum analyzer to tune it for you needs.
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I've experienced that with Ham repeaters running digital and programed the radio to skip the channel.
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Split tones are just as described above. Unless it is DCS, which is really not a tone, it's a digital code. Those codes can run normal polarity (N) or, reverse polarity (R) on either transmit or, receive. We have a repeater in Phoenix that runs split DCS, (programing = CROSS, 071N, 225N, CROSS -> CROSS) as well as travel tone. The DCS (or DTCS as it may be referred to when programing) is used for normal everyday traffic and, as a means of keeping the repeater private for members only. The travel tone is programed into a separate channel (same repeater frequencies) in the radio and used for weekly nets, another set of tones is for tactical (emergency services), and so on. This way, members that don't want to listen to the net can stay on their "home" channel with the DCS, and not hear the net traffic.
Radios that are capable of using distinct, different, DCS codes are not that easy to find. Most times you have to ask the manufacturer the specific question. That said, most commercial radios (part 90), should be able to handle it. The Baofeng UV82C is one such handheld.
Hope this helps!
Wouxun KG 1000G Modulation problem
in Technical Discussion
Posted
I think time is catching up to me; time, newer regulations, and new terminology. When I was in radio technology between 1975 and 2001 Wideband was Wideband and Normal the +/- 5KHz. Apparently, what was Normal, is now considered Wideband, and Narrowband is really narrow, and what they use for FRS radios. Now, with the narrowband commercial repeaters, the mobile or portable should be programmed for Wideband for repeater and simplex, unless they are operated on GMRS channels 8 through 14 (the interstitial 0.5watt channels) which should then be programmed for narrowband. I'm going to assume that the majority, if not all radios, have built-in limiting for those frequencies.