Buying R75. What do I NEED?

[safetyobc]

I am saving up for an Icom R75.

I am also going to buy a SWL Antenna. Probably this one.

What type of coax and ends do I need? I have no clue about this stuff. I am assuming I can buy a certain length of coax with the ends already installed so all I have to do is hook it up?

I may put the antenna in my attic. If so my coax length will only need to be probably 25 feet or so. If I go outdoors with it, I may need 50 feet of coax. Not sure if that would matter much at those frequencies?

Any other accessories or parts that are needed for monitoring the HF bands?

(I am slowly saving. Just trying to get an idea of price. I am half way to the R75 now, so it will be a while before buying lol).

Thanks!

[hertzian]

At the same store, you'll find pre-assembled coax jumpers with PL-259 plugs at each end. You could pick up the RG-8X in a variety of lengths. At hf, these should be fine with your lengths listed.

I also read in one of the reviews of a guy using RG-6, so if you wanted to use that all you'd need are two female F to male PL259 adapters. I don't see any problem with using 75 ohm RG6 in this application, but then again I've never used a par end-fedz antenna. The fm/airband filters I use from PAR work well.

I've got a feeling you are starting out and really don't have any specific needs, so unless you want to homebrew, this combination will definitely give you a starting point which you can refine later. It would be hard to recommend anything if you don't have anything specific - other than to think about homebrewing your own. Be sure to check the HF antenna wiki.

I'd avoid the attic if you can - low mounting height, coupling to other junk up there, and no real ground which it looks like the PAR wants to use unless you just cross your fingers, might be a tough call.

[safetyobc]

Thanks for the info!

My main listening focus is Ham on HF, a little SWL, and Military type monitoring.

Thanks!

[jaspence]

If you buy coax with PL-259 connectors pre-installed, you may have problems getting it through tight places, so check where the cable run has to go carefully. I would avoid adapters if possible, as that is just one more connection than can degrade the signal, especially if you mount it outside.

[N5DRM]

An excellent choice for an HF receiver. I have one and love it. The antenna you linked to is a good one, but wondered if you are into building one yourself and saving about $70 dollars? I ask because I built my own, basically the same one you're looking at buying, from an instruction I found online. A fellow ham and SWL in the UK posted it. I'm using it with a 50' wire and have excellent coverage all across the bands. My primary listening is to civil air, government and some WXFAX, and Amateur Radio. If you want, I have the materials on hand to build another one and get it to you. I'm in North Little Rock. Send me an email to (david@n5drm.com) and we'll go from here. I also have many documents: Phil's cookbook, filter selection tips, the Icom receiver service manual and much more I'll put on a CD and send it to you. I use about 25' of Belden RG-58 coax from the outside location to the receiver. The antenna is well grounded and I have no issues with noise or local interference. I'll be happy to help any way I can. BTW, I'm the LilKase guy from a few years ago. We did some business I recall. Hope to hear from you.
Take care.
David
N5DRM

[safetyobc]

I attempted to email you but it returned delivery failure at that email.

Here is the email:

Hello David!

Good to hear from you on the rr forums. Last I remember you moved out west. Glad you are back in Arkansas and hope all is well with you and your family.

I am very interested in building my own antenna. I don't know much about Antennas but am eager to learn. I am quite a ways from being able to buy my R75. Saving is slow with 3 kids lol. But I do want one and hope to have one by the end of summer do there is no real rush on getting an antenna up. I would like to have it in place when I get the R75.

I would also love any freqs you monitor from here in AR. HF is unknown ground for me. I currently have a Degen DE1103 (same as the Kaito 1103).

At some point in the distant future I want to get my Amateur Radio License, General Class so I can work HF. But that I well down the road.

Any info you can share would be much appreciated!!

Thanks!

Matt

[ridgescan]

Originally Posted by jaspence

If you buy coax with PL-259 connectors pre-installed, you may have problems getting it through tight places, so check where the cable run has to go carefully. I would avoid adapters if possible, as that is just one more connection than can degrade the signal, especially if you mount it outside.

I agree. Building your own coax ends is very easy and kinda satifying (lol) you should learn to build too. I have seen it come in very handy several times over-you tend to change setups and configurations in this hobby
here's a sample video I personally like
PL-259 Installation Made Easy for RG8X - YouTube

have fun with your r75-great radio I love mine
also-I use LMR240 coax as my feedline- it is the LMR400's 'little brother' with close #s to the 400 and is outstanding shield wise and weatherwise-but very very seldom mentioned anywhere. Good prices too. Between its double shielding and a good 2-point ground system here, I have a nice noise situation.

[nmelfi]

I chose the par end fed for my r75 and it worked good. Then I went to tractor supply and bought a quarter mile long spool of #17 electric fence wire for about 20 bucks and strung 400 feet of it in place of the supplied wire. I grounded the sheild of my Rg6 quad shield on the par transformer to my house electrical ground and have little noise problems and can pick up more than I have time to listen to!

[safetyobc]

Electric fence wire really? I have a whole spool of that!!!

[nmelfi]

I was worried about the galvanized part because of the small amount of lead in it, but it works fine. I am planning on running a couple hundred more feet of it and trying it as a giant loop antenna.

[safetyobc]

So how would I go about connecting that to my radio?

[ridgescan]

Originally Posted by nmelfi

I chose the par end fed for my r75 and it worked good. Then I went to tractor supply and bought a quarter mile long spool of #17 electric fence wire for about 20 bucks and strung 400 feet of it in place of the supplied wire. I grounded the sheild of my Rg6 quad shield on the par transformer to my house electrical ground and have little noise problems and can pick up more than I have time to listen to!

gees I believe ya! That sounds like one potent antenna!

[nmelfi]

I hear a closed loop makes it less prone to noise, any input as to running another couple hundred feet and making it a loop?

[bigblue2]

Originally Posted by safetyobc

So how would I go about connecting that to my radio?

Buy an MFJ-1779A, a single band dipole 265 feet used for 160M then connect your 400 feet (200 feet each for the pair) by wiring the ends, then connect the coax to the back of the radio usually it has PL-259 coax connector. Buy the coax connector for 3 dollars each, 12 feet or 20 feet. Then connect them. But I stand to be corrected.

Or disassemble the MFJ-1779A and replace it with your 400 foot wire or paste half of the wire in ceiling or V-shaped from your window in 4th floor to backyard..or whatever you think would work or ask for advice.

[safetyobc]

Thinking of picking up a used R71a or R72 to save a little money. Any thoughts on that? Good/Bad decision or should I just save and go for the 75?

Thanks!

[trap5858]

Have you looked at the reviews on E-ham.com? There are some interesting thoughts by people who own those radios. I, myself am looking for an R-75. The R-71 seems to get good press on that site so it is worth a look. What I have seen on E-bay are the prices for those radios are not a whole lot lower than an decent used R-75.

[bigblue2]

Don't fall for the myth on R-75 speakers. They're crispy clear. Weak signals usually result in garbled voice but once my radio got hold of 1 Mhz and they were crispy clear, I was enlightened. They all depend on antennas. Read Monitoring Times. You're come across those who specialize on Longwave listening and their radios are R-75s. They're the best! Believe me! Imagine these longwave listeners catching 200 khz crispy clear on their R-75 radios!

[abear27]

I picked up an R75 about a month ago - It's a fantastic piece of hardware and easy to get started with.

I live in a townhouse where I can't really put much of an outdoor antenna up, however I do have 50ft of speakerwire spread around the house and the results are surprisingly decent. I am getting EAMs on the HF-GCS freqs and aircraft on the NAT-D freqs.

I am quite sure once I can properly ground the radio and get together some kind of proper antenna my results will improve. The learning and experimentation is half the fun!