Sennheiser 300 series radio microphones - frequencies

[ph507]

Just wondering if the Sennheiser 300 series radio mic's can be used with other frequencies other than those found in channel 69/70. I wish to use more than 14 microphones simultaneously and am unsure if they work with other channels like the higher end 3000/5000 models. Cheers.

[Shez]

Assuming you have the E version, they cover 830 - 866MHz. That's channels 66 -70.

Obviously you'll need an intermod free frequency plan and the appropriate licences.

[StevieR]

What shez said.

 

PM me and I'll email you the recommended frequency sets for channel 67 and 68. JFMG will be able to advise if these channels/frequencies are available in your area.

 

Steve

[ph507]

Would I be able to run 20 of the 300 series (type E) together intermod free? Thanks.

[StevieR]

Yes, so long as you can obtain the additional licenses in your area. You'll need to spread them across 3 channels to achieve this though.

 

Steve

[ph507]

Thanks very much for the reply, can one of the channels used include 69 to minimize number of channels requiring a fixed site license?

[Shez]

You should be fine using ch.69 as one of the three. I'm sure Sennheiser could whip up a channel plan for you using 67, 68 and 69.

[dunk_1984]

SIFM gives these results for frequencies between 830 and 866mhz on evolutions.

 

1 830.000 MHz

2 830.300 MHz

3 830.700 MHz

4 831.200 MHz

5 831.800 MHz

6 832.600 MHz

7 833.900 MHz

8 835.500 MHz

9 837.200 MHz

10 839.600 MHz

11 840.600 MHz

12 843.100 MHz

13 845.900 MHz

14 848.100 MHz

15 854.200 MHz

16 858.900 MHz

17 861.900 MHz

18 865.700 MHz

[Shez]

SIFM gives these results for frequencies between 830 and 866mhz on evolutions.

I think you'd need to set the limits to 830.1 and 864.9 to avoid straying out of those bands. Or up to 862.9 to steer clear of ch.70 would be even better.

[dunk_1984]

Yes, Well, at 0.300Mhz spacing you can get 17 frequencies, and at 0.200Mhz spacing you can get 18 frequencies.

 

1 830.100 MHz

2 830.400 MHz

3 830.800 MHz

4 831.300 MHz

5 832.100 MHz

6 832.700 MHz

7 834.200 MHz

8 835.200 MHz

9 837.000 MHz

10 839.200 MHz

11 841.600 MHz

12 844.600 MHz

13 847.900 MHz

14 851.400 MHz

15 855.100 MHz

16 859.600 MHz

17 860.700 MHz

 

OR

 

1 830.100 MHz

2 830.300 MHz

3 830.600 MHz

4 831.000 MHz

5 832.000 MHz

6 832.600 MHz

7 834.100 MHz

8 835.200 MHz

9 837.000 MHz

10 838.200 MHz

11 840.900 MHz

12 845.200 MHz

13 849.900 MHz

14 853.200 MHz

15 855.400 MHz

16 859.100 MHz

17 861.900 MHz

18 862.700 MHz

 

Would I be able to run 20 of the 300 series (type E) together intermod free? Thanks.

 

Apparently not. Although that is a lot of hand held radio Mic's, can I ask why you want 20?

[ph507]

Not hand-held radio mic's, body-pack transmitters, need 20 UHF along with 8 VHF for a musical.

 

According to the Sennheiser evolution series frequency chart, bank 1 has 20 frequencies. Although it seems that only the first 8 are pre-programmed into the 300 series so I presume I would have to put them in the user bank on each tx/rx? So it may be possible to get 20?

 

Anybody know if any of the above is possible? Thanks.

[StevieR]

Yes, all quite possible. Done it quite a few times.

 

The user bank will store 8 frequencies on the 300 range. A lot of the preset frequencies do not tie up with the preferred sets with only one of the banks (6 I think) having the channel 69 frequencies already set. Retune the user bank presets to your new set of frequencies.

 

However, the frequencies given above by Dunk don't look like the ones I've used previously but I would need to get my charts out in the office to check.

 

 

Steve

[dunk_1984]

However, the frequencies given above by Dunk don't look like the ones I've used previously but I would need to get my charts out in the office to check.

 

Generated by SIFM.

 

http://www.sennheiser.com/sennheiser/icm_e...s_sifm_software

[Shez]

I'd be inclined to try to use as many of the ch.69 frequencies as possible with the remainder drawn from 67 & 68. Unless you have a decent budget for licencing 20 coordinated freqs of course. In which case, bank one is probably your best bet - there are 20 intermod free frequencies in there. Refer to the "additional information" bit of paper that came with the mics for those beyond the eight that are preset in the 300 series.

[Acoustic]

When your using multi radio mics you need to keep 500mhz spacing between bands to get noise free operation, anything below this gets you into the intermodulation zone.