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Eric, I've been building, modifying and servicing repeaters since 1977. I started out with the tube equipment running separate sites then a single site with separate antennas but migrated to the?

Showing my ignorance I did not know a "balance" meter existed. -- Regards, Karl Shoemaker To contact me, please visit SRG's web site at http://www.srgclub.org for the current email address. -

Does anyone need anything from this before it goes away? Cleaning out. Will Contact radio5000 (at) aol (dot) com

Very true on the TX phase noise point. I’ve fought with a user at 451MHz using an icom mobile with no bandpass or isolator. They were a few MHz away and desensing us bad. It turns out my desense was

Andrew, You may want to specify which range you require. VHF Range 2 Quantars (150-174) are much more common than VHF Range 1 Quantars (136-150). While the Range 1 Quantar will do the whole 2M range

Also, mobiles are designed for freq agility, therefore a wider bandwidth. The older GE MII and MICOR and MSF5000 , were tuned for fixed freq operation as a repeater. Narrow band operation. Not 138 to

Do not forget the issue of phase npise on a TX or the RX local oscillators. GE MII and MOT are usually a lot cleaner. I have experienced RX desense where Yaesu radios transmitted , vs MOT mobiles

I ran into what I think is the same issue a couple years ago. I had picked up an XPR8300 that CPS absolutely could not see. I bought a replacement network interface thinking it was a hardware problem;

I see no problem with using two mobiles and I do it all the time and the performance is identical to the fancy repeaters. Sensitivity: I don’t see much difference in RX sensitivity between most

There have been a lot of comments on this subject, unless I missed something, no one has said anything about NOT using amateur mobile radios to make a repeater. This would include Fusion. Often times

35 dB notch depth is a bit low with loops set for 0.7 dB IL. That indicates the capacitor is shorting out. Piston trimmer caps are rather fragile beasts. There are several concentric plates in the

For ham repeaters usually the ones that put them together out of parts know how to work on them and will take time to fine tune the repeater.? The ones that just set the commercial box down are not

The R1225 is rated at 25 watts continuous. That's not 25 watts out of the duplexer either. That's where a lot of people make a mistake. Run them at 25 watts out of the radio (or better yet, 20) and

True, but I have had success at running them at 22 watts.? have a couple of them here that I use for backup replacement repeaters while doing repairs. The last time I used it was on a VHF ham

The r1225 is still not a 100% duty cycle machine. They have a week spot at full power? the solder melts on the final and causes a failure we have on in service but cut back to 20 watts. Not always

Not always true.? For example, the Motorola R1225 repeater appears to be a mobile, but the heat sink is much larger than on the regular M1225 mobile. Joe

Hi guys.? I have an issue with USB comms to an early model XPR8300 repeater.? ?It's has been extremely stubborn.? ?I've tried everything, different PC's, different cables, both CPS16, and CPS2,?

Yep bad cap. I have had that happen a couple times. Also the BPBR coupling loops for the VHF telewave cavities for 2M are a tad longer than those use in the commercial region. There was a write up

If it's the cavity on the antenna side, more than likely it took a lightening hit. Replace the capacitor and you should be fine. Just make sure you get the highest voltage one you can find. I would

Typically one gets a receiver with a tuned preselector front end, a decent IF response curve, and god squelch circuit action, as well as a transmitter that has much lower phase noise with a factory