AdmiralCochrane

I'd buy and put up a tower to use simplex before I bought a repeater. People spend fortunes on other hardware, but in truth, RF comms are more dependant on the antenna and its placement than any other component. Without a well placed antenna over it, a repeater is just money in someone else's pocket .

Starting this week there wil be a discussion net on the Towson 600 repeater in central MD. The repeater is located at pretty high elevation on a tower in Towson MD and has a large coverage area. It comes in clearly as far as Edgewater to the south and the PA line to the north. To the east it propagates well into western and central Cecil and Kent Counties. Not sure how far west it works, but I would imagine most or all of Howard County. Perk up your ears and if you can hear the net, give a try to check in. We will be listening!

Always depends on the exact location. There are places in Alexandria and Arlington that you can hardly reach a mile with 50 watts because of structural obstacles

In my area not all agencies have moved to P25 and there is still a lot for a kid to listen to. I still use a BC245XLT from time to time. I bought it on eBay a couple years ago, since 245XLT is no longer state of the art, it can be had cheap

Its called "kerchunking" the repeater. Technically its not legal, but people do it all the time.

I have used this scheme and even found my radio to be sensitive to the plane of the ground wire if held perpendicular to the antenna. Best reception was with the loose wire pointed directly to or away from the other transmitter.

Sometime in a previous life my employer was contracted to do specialzed maintenance at cell locations. One service call for no signal from the equipment invovled in our contract turned out to be the fact that the cell tower primary owner forgot to pay the electric bill and the meter had been pulled. The tower stayed on line an additional 30 hours then the generator fuel tank went dry. All cell towers are subject to random mistakes as such.

No. No difference that you could tell

And discount what you will hear about the Slim Jim variant. It has been debunked, it has no more gain than a plain J-pole. The myth of the Slim Jim goes back to an early article about the design that "hopes" to have higher gain. No such improvement was ever detected, but the legend goes on via "Post Office" game repetition of the original story with the details left out.

A good J pole should have about 3db gain. There are variations with a little more gain, but I am not fully versed in them. I have successfully made and used 3 J-poles and am currently using one on my 1.25m Alinco. My nanonva and wattmeter both say the SWR is in the 1.1:1 range, where my Comet triband antenna is about 1.5:1 on 1.25m

Well covered for commercial passenger flights. There are private pilots that are hams and use their HT's while in flight. Height is might, line of sight, baby!

I have no trouble using Chirp on Macs. You do have to tell the Mac that you do want to run the program you found on the internet.

And the only one remotely near northern VA is the Alexandria repeater already mentioned. The others are much too far away to consider.

There is another GMRS repeater coming to PG County in the next few months. If you can hit the Baltimore 675, also try the Towson 600 machine.

If you set up a broadcast station, you deserve to be df'ed and mugged. Any real plan that went as far as considering encryption, should also include coordination of limited time on air, multiple frequency and/or band usage, mobile or at least movable transmitting to avoid df attempts. I've been following some threads on other forums on the same lines of thought and learned a little about fast acting single point df equipment. To say its expensive and exotic is understatement.

Pretty install. SWR meter is OK, but the nanonva is the real tuning tool these days The anylizer will let you tune to whatever center frequency you think is best and estimate the fall off both ways from your center tuning point. Not saying the SWR meter has no use, it gives different info, so in some particular troubleshooting cases its better. A real gadget guy will have both.

Some CB'er drove by my house today yelling "Audio! Audio! Audio!" Came in clear on my stereo speakers

The same reflection and/or refraction occur with a repeater in Maryland working into/out of Washington D.C. Colocated on the same tower and linked, the repeater owner has both VHF and UHF repeaters. One would expect the VHF repeater to work better into the heart of the city, but in fact, the UHF repeater has better penetration and users transmitting to the repeaters are heard better on the UHF repeater.

I mentioned lightning damage to my HF radio on FB and magically 2 replacement boards appeard on eBay within 48 hours

I'd move the bracket to the peak of the roof and mount a good antenna as high as possible, its almost impossible to "power thru" trees

I run my coax to my triband antenna exactly as DowneastNC suggests. My UHF element is resonant enough to give OK SWR on GMRS. I think it was actually 1.11:1 on 440 and 2.10 on GMRS. I recently upgraded the coax to LMR600, but I should actually bump it up another 5 ft; right now its about 40 ft up.

The Surecoms seem to be popular, but I am put off by their cheesy appearance.

I laugh at the 5% off offers, they are a joke

Very good explanation. When our local elmer gives a Tech class one of the last day hands on class demonstrations is each student actually using HT's brought in by other club members under their direct supervision. This is done in the parking lot right under the repeater. Probably half of the HT's are CCR's but I have never noticed a desensing problem during the class demonstration. I guess we have been lucky with the hardware volunteered.

Boxcar put the correct qualifier on it. It varies by location. IN MY AREA there are probably 60 repeaters, 4 or 5 don't use tones, the other 50+ do.